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  1. #1
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    Forks: Complete Axle to Crown Lengths Library

    I spent some time talking with different manufacturers about Axle to Crown Lengths. Unfortunately they dont all follow a standard, so changing from Brand A to Brand B of the same travel, can have more effect on handling than just the dampening characteristics. You could have as much as 1/2 degree variation in head tube angle using different brands with the same travel. FOR ESTIMATING PURPOSES ONLY: Typically you can estimate a 0.5 degree (1/2 degree) change in Headtube Angle for every 10mm of Axle to Crown Length changed.

    Below is a list of Manufacturers Specified Axle to Crown Lengths. It would be great if anyone would measure their fork and list the length so it can be added in parenthesis so we can see what the margin of variance actually is. The next post gives directions on how to measure Axle to Crown Length on your fork.

    Please Copy and Paste the following information into your reply and fill it out completely.

    Manufacturer:
    Model Year:
    Model:
    Travel:
    Axle to Crown Length:
    Custom Work: (PUSH Industries, Garage Works, Hippie Tech, etc.)


    THIS IS NOT A COMPLETE LIST, I WILL BE ADDING TO IT FOR THE NEXT COUPLE DAYS. 29er forks and listings from DT swiss, White Bros and Maverick coming.

    FOX Fox Racing Shox Website
    Current Model Year Unless Noted Otherwise

    All models +/- 5mm

    32mm Forks

    F80: 450.9mm
    F90: 460.9mm
    F100: 470.9mm
    F120: 490.9mm

    Float, Talas, Van 130: 500.9mm
    Float, Talas, Van 140: 510.9mm (08 Talas: 515mm)
    Talas 150: 520.9mm

    36mm Forks

    Float, Talas, Van 160: 545.3mm

    40mm Forks

    Fox 40 180: 545.8mm
    Fox 40 203: 571.2mm

    ROCKSHOX RockShox website Axle to Crown Chart
    Current Model Year Unless Noted Otherwise

    All models +/- 5mm

    28mm Forks

    99-08 SID 63: 434mm
    99-08 SID 80: 451mm

    32mm Forks

    Argyle 80: 471mm
    Argyle 100: 491mm

    SID 80: 453mm
    SID 90: 463
    SID 100: 473

    Dart 80: 454mm
    Dart 100: 471mm
    Dart 120: 501mm

    Tora XC/SL/RACE 80: 450mm
    Tora XC/SL/RACE 100: 470mm

    Tora AM 80: 459mm
    Tora AM 100: 479mm
    Tora AM 120: 499mm
    Tora AM 130: 509mm

    Recon XC/SL/RACE 80: 451mm
    Recon XC/SL/RACE 100: 471mm

    Recon AM 80: 459mm
    Recon AM 100: 479mm
    Recon AM 120: 499mm
    Recon AM 130: 509mm

    05-08 Reba 85: 458mm
    05-08 Reba 100: 473mm
    05-08 Reba 115: 488mm

    Reba 80: 453mm
    Reba 100: 473mm
    Reba 120: 493mm

    06-08 Revelation 100: 478mm
    06-08 Revelation 115: 493mm
    06-08 Revelation 130: 508mm

    Revelation 140: 521mm
    Revelation 140 w/Maxle Lite: 518

    Pike 95: 473mm
    Pike 140: 518mm

    Boxxer Ride 130: 494mm
    Boxxer & Ride 174: 544mm
    Boxxer 200: 568mm

    35mm Forks

    Domain 115: 500mm
    Domain 160: 545mm
    Domain 180: 565mm

    Lyrik 115: 500mm
    Lyrik 160: 545mm

    40mm Forks

    Totem 135: 530mm
    Totem 180: 565mm

    MAGURA Magura Website
    Current Model Year Unless Noted Otherwise

    All models +/- 5mm

    32mm Forks

    Odur 85: 458mm
    Odur 100: 473mm

    Menja 85: 458mm
    Menja 100: 473mm
    Menja 130: 498mm

    Durin 80: 453mm +/-3mm
    Durin 100: 473mm +/-3mm
    Durin 120: 493mm +/-3mm

    Thor 140: 520mm

    36mm Forks

    Wotan 160: 540mm

    MANITOU Manitou website
    Current Model Year Unless Noted Otherwise

    All models +/- 5mm

    32mm Forks

    R7 80: 456mm
    R7 100: 476mm

    Minute 100: 478mm
    Minute 120: 498mm
    Minute 130: 508mm
    Minute 140: 515mm

    Nixon 145: 518mm
    Nixon 160: 540mm

    Gold Label 80: 460mm
    Gold Label 100: 480mm

    34mm Forks

    Travis Single 180: 572mm
    TravisTriple 180: 562mm
    TravisTriple 203: 585mm

    MARZOCCHI Marzocchi website Axle to Crown Chart
    Current Model Year Unless Noted Otherwise

    All models +/- 5mm

    28mm Forks

    TXC 60: 466mm

    32mm Forks

    22 100: 479mm
    22 120: 499mm

    33 80: 447mm
    33 100: 467mm
    33 120: 487mm

    44 120: 487mm
    44 140: 507mm

    4x 100: 490mm

    Corsa 100: 467mm

    DJ 100: 490mm

    35mm Forks

    55 160: 541mm
    55 ATA Micro 165: 546mm

    38mm Forks

    66 180: 564mm

    888 200: 567mm

    Maverick Maverick Forks
    Current Model Year Unless Noted Otherwise

    32mm Forks

    SC32: 495mm

    DUC32: 520mm
    Last edited by mxracer33x; 11-26-2008 at 10:32 PM.

  2. #2
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    How to Measure your Axle to Crown Length:

    It is preferable to measure in millimeters, but anything you have can be converted with decent accuracy.

    First remove the front wheel and place your thru-axle or quick release back in the fork. Pull on the lowers to make sure they are fully extended, sometimes stiction will occur and your measurement wont be accurate.

    Measure from the top of the crown (bottom of Headset race), behind the Arch on the lowers, and to the center of the backside of the Axle. This should give you a measurement accurate within a couple millimeters.





    Last edited by mxracer33x; 11-18-2008 at 02:35 PM.

  3. #3
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  4. #4
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    look on the sram website on the manufacturer section and you'll have all the RS ones

  5. #5
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    Yeah but the Sram site is way out dated for the most part. That is one of the problems I found. Ive got most of the current ones, just got a bit to get done before I can get back to filling in the blanks.

    Edit: I just saw at the very bottom of the list is the full chart of just A2C lengths. RockShox A2c Chart
    Last edited by mxracer33x; 11-18-2008 at 02:50 PM.

  6. #6
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    Thank you so much mxracer33x !!! This is Great. U just save me a lot of time
    searching for this info as i am buying a new fork. Btw, real nice bike u got there !!

  7. #7
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    this would make a good sticky

  8. #8
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    Good thread. How about some data on the cheaper forks that people would be upgrading from?? You've got the Darts covered, but how about Suntour, etc.
    Originally Posted by Vtolds/Dremer03---- "assume any bikes left unlocked and unattended are free to take"

  9. #9
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    Some more a2c info is available here: http://www.velik.org/components/com_...le=AxleToCrown

    upd: url fixed

  10. #10
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    Quote Originally Posted by Noobi-Wan Kenobi
    Good thread. How about some data on the cheaper forks that people would be upgrading from?? You've got the Darts covered, but how about Suntour, etc.
    don't take this the wrong way, but if you have a suntour than don't worry about the axle to crown height as it has not as much of an importance

  11. #11
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    a2c

    Quote Originally Posted by Curious-George
    don't take this the wrong way, but if you have a suntour than don't worry about the axle to crown height as it has not as much of an importance


    Well, since all forks have an axle to crown height, I have to disagree with your statement. Maybe I just don't understand what you are trying to say. Please explain.

    Actually, we should leave this thread free of this kind of discussion and let it be a gathering of data, so don't explain.
    Originally Posted by Vtolds/Dremer03---- "assume any bikes left unlocked and unattended are free to take"

  12. #12
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    Absolutely Bloody Marvelous!!! Brilliant Work!!!

  13. #13
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    Cool thread. Very helpful.
    roccowt.
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  14. #14
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    Cool and great Thanks!

    Totems are 40mm btw.

  15. #15
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    Quote Originally Posted by dirtbag
    Totems are 40mm btw.
    Thanks! Its easy to miss that stuff when your going down the list.

    Hopefully Ill get teh 29er stuff and a coupl more manuf. done friday. If not early next week for sure.

  16. #16
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    Thanks for this!

  17. #17
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    Quote Originally Posted by Curious-George
    don't take this the wrong way, but if you have a suntour than don't worry about the axle to crown height as it has not as much of an importance
    So you are saying that a person upgrading from a 100mm suntour fork does not really need to care what the axle to crown figure of the old fork was when selecting a new one?

    I guess that goes for Marzocchi now too...

  18. #18
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    Sorry to see that DT Swiss didn't make the list.

  19. #19
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    Quote Originally Posted by other aardvark
    Sorry to see that DT Swiss didn't make the list.
    My DT Swiss EXC 150 20mm TA is 520mm (so slightly less then the official reading). Others have given the same number.

  20. #20
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    Quote Originally Posted by dropadrop
    My DT Swiss EXC 150 20mm TA is 520mm (so slightly less then the official reading). Others have given the same number.
    How are you going with EXC, worth the money???

  21. #21
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    Quote Originally Posted by other aardvark
    How are you going with EXC, worth the money???
    It's still in the box... Hopefully I'll get it togeather today, and get to ride on the coming weekend.

  22. #22
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    Quote Originally Posted by dropadrop
    It's still in the box... Hopefully I'll get it togeather today, and get to ride on the coming weekend.
    They certainly look fantastic and Im hoping they perform as good as they look cause the light weight could put my Nomad in the sub 30 pound category.Pm me on how it goes.

  23. #23
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    nice.

    great reference chat, just what I was looking for. thanks!!

    this would be a good sticky

    Porch
    "If we were Vikings, Rocky Mountain aspen stands would be our Vahalla and its singletrack our bounty" - Mtn Flyer Mag #14

  24. #24
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    Why isn't this stickied? It's super useful, yet it was almost hard to find...
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  25. #25
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    sweet thread! really helpful for anyone looking to get a fork compatible with their frame, or vice versa. +1 to the idea of this being a Sticky.
    Go ride your bike.

  26. #26
    wuss
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    When this thread was written the info was hard to find, now google will give this list from 50 different places if you search for it.

  27. #27
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    Yeah, but I want it in one place...
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  28. #28
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    Anybody have measurements on the manitou 29ers? Can't find them anywhere.

  29. #29
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    Stole this from RideMonkey. Some over lap but it had an older fox that I was looking for.

    Quote Originally Posted by Superdeft View Post
    This might help:


    2007 Models Axel to Crown

    Corsa WC 80mm 464mm
    Corsa WC 100mm 474mm
    XC700 SL 464-504mm
    XC600 474mm
    XC500 474mm
    Z1 RC2 538mm
    Drop Off 3 538mm
    AM SL 1 511-551mm
    AM 2 531mm
    AM 3 531mm
    4X WC ?
    DJ 1 483mm
    DJ 2 483mm
    DJ 3 483mm
    Dirt Jam Pro 483mm
    66 SL 1 ATA 525-565mm
    66 RC2X 565mm
    66 RC2 ETA 565mm
    888 WC 584mm
    888 SL ATA 554-584mm
    888 RC2X VA 584mm
    888 RV 584mm
    Super T RCV 574mm
    MX Pro ETA 508mm
    MX Pro ETA 488mm
    MX Pro 488mm
    MX Pro 468mm
    MX Comp 1" 468mm
    MX Pro I.S. 488mm

    CANNONDALE

    lefty 140 spv : 510 mm

    FOX

    vanilla R 2005: 510 mm
    Talas RL 2004: 490 mm
    Talas RLC 2006: 503mm
    vanilla 2004 un peu moins de 500 mm
    Float 80mm : 451mm
    100mm : 471mm


    36 Talas(2006) en 150mm : 535mm
    en 110mm : 495mm
    36VAN RC2 (2006) en 160: 545mm
    40 (2006) : en 178mm : 546mm
    -------------- en 203mm : 571mm

    MARZO

    Z1 130mm drop off QR20: 503mm (2001)
    Z1 FR SL (2003) 530 mm
    Z1 FR 130 (2005): 518mm
    Z1 FR 150 (2005): 538 mm
    Z1 MCR (2001)130: 510mm
    Z1 LIGHT ETA 150mm (2006): 538.5mm
    Z3 Flylight 100mm (2000): 500mm
    Z5 air en 100 (2001): 478 mm
    888 (2005) en 200mm, 605mm
    888 (2005) en 170mm, 575mm
    888 (2006) en 200mm: 579mm
    66 (2005) en 170mm, 595mm
    66 (2005) en 150mm, 575mm
    66 (2006) en 170mm: 555mm
    66 (2006) en 150mm: 535mm
    Marathon S millésime 2002 100mm -> 480 mm
    Marathon S 120mm (2005): 495mm
    Marathon XC 120mm 2005: 495mm
    MX Comp en 105mm: 478 mm
    MX Comp en 105mm (2006): 484.3mm
    MX Comp en 120 mm : 493 mm
    MX Comp en 120mm (2006): 499mm
    MX Comp en 85 mm : 458 mm
    MZ comp en 100 mm: 488 mm
    EXR PRO en 105 mm: 478 mm
    EXR PRO en 120 mm: 493 mm
    all mountain 110 498mm
    all mountain 130: 518 mm
    all mountain 150 (2005): 538 mm
    all mountain 150 (2006): 541.5mm
    DJ2 2004 = 500mm
    DJ en 100 mm (2005): 488 mm
    DIRT JUMPER (2006) en 100mm: 483.5mm
    shiver sc 120 mm : 510 mm
    shiver DC: 572mm
    Junior T 2003/2004/2005: 555mm
    Junior T 2001 = 540mm
    Monster en 200 mm: 595 mm

    ROCK SHOX

    pike: 517mm
    Lyric en 160mm: 545mm +/- 5mm
    Domain en 180mm: 565mm +/- 5mm
    Totem en 180mm: 565mm +/- 5mm
    Reba 85mm: 458mm
    Reba en 100 mm : 473 mm
    reba 115mm: 488mm
    Boxxer 04 (178mm de débattement), 555mm en position basse
    Boxxer 2005 race, team et world cup en 203mm : 570mm en position basse
    Psylo SL uturn : 510 mm
    Duke XC 80 mm 2004 : 460 mm
    Duke C (année inconnue) 80 mm de dbt : 440 mm
    Pilot en 100mm : 475mm
    SID RACE 80mm: 442mm
    SID SL 2001 80mm: 450mm
    SID 1998 63mm : 435mm
    Revelation 130mm (2006): 508mm
    Revelation 100mm (2006): 478mm

    PACE

    Distance RC 39 modèle 2005 en 100 mm: 470mm
    RC41 Fighter en 150mm 2006: 524mm


    MANITOU

    Axel Elite 100mm : 480mm
    Skareb Super TPC 100mm (modéle 2005): 475 mm
    Black Platinum (Reglage maximum):515mm
    black comp 2002: 475mm en debat 100mm
    Stance Flow:502/532mm
    Stance Kingpin: 540mm
    Stance Static 80mm: 460mm
    Stance Static 100mm: 480mm
    Dorado DH: 542.5mm
    Sherman Breakout Plus: 512/552mm
    Sherman Flick Plus: 492/532mm
    Sherman Firefly Plus: 492/532mm
    Sherman Jumper: 455mm
    Sherman Jumper 110mm : 480mm
    Sherman Slider Plus: 540mm
    Nixon Platinum/Super/Elite: 518mm
    Minute 1/2/3: 505mm
    Minute 3 (en 100mm): 470 mm
    Millenium: 505mm
    Splice 100 mm: 505mm
    Splice Elite 130mm : 525mm
    R7 (2006) en 100mm: 470mm


    MAGURA

    Big Ego en 185 mm : 580 mm
    Thor en 150 mm : 535 mm
    Ronin en 110 mm : 483 mm
    Phaon en 125 mm : 504 mm
    Asgard en 100 mm : 476 mm
    Asgard en 80 mm : 456 mm
    Vidar en 80 mm : 456 mm
    Quake 115 double té: 525 mm
    Whats this line for?

  30. #30
    gmk
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    some measurements are really not correct

    "Show your bike some love and it will show the love back."
    Eric, niner bikes

    the most important vehicle is a 29er bicycle

  31. #31
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    Quote Originally Posted by gmk
    some measurements are really not correct
    Well thanks for correcting them...

  32. #32
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    2011?

    Fox 32 150MM
    Rockshox revelation 150mm?

  33. #33
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    When switching from a rigid traditional fork to a suspension fork am I correct in assuming I should remove the recommended sag height % mm's to match my existing geometry? My head is spinning.

  34. #34
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    Quote Originally Posted by Nsynk
    2011?
    Rockshox revelation 150mm?
    529 according to BTI
    Last edited by e-luder; 09-18-2010 at 10:23 PM.
    Whats this line for?

  35. #35
    wuss
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    Quote Originally Posted by dbtahoe
    When switching from a rigid traditional fork to a suspension fork am I correct in assuming I should remove the recommended sag height % mm's to match my existing geometry? My head is spinning.
    Pretty much yes. Even after this the geo will be slightly changed as there are a lot of situations where you are actually leaning on the fork making it compress further then sag.

  36. #36
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    150mm to rigid question..

    I'd like to get a rigid fork for my Evil Sovereign (26" hardtail). I currently run a 150mm Fox Float on it. Would I be better off looking for a 29er fork? Or does anyone make a rigid fork that would keep essentially the same geo of my current setup?

  37. #37
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    The 29er models are 30mm longer a2c than a 26in model with the same travel.

    Looking through all the spec sheets, it appears that the values do not change from 2007 to 2011 for Fox, so the values posted in this thread for Fox should be valid no matter what year you have (as long as its from 2007 to 2011).

    All Fox 26in 32mm forks (F-Series, FLOAT, TALAS, Vanilla) are 370.9mm plus travel a2c:
    http://service.foxracingshox.com/con..._SPEC_RevA.pdf

    All Fox 29in 32mm forks (F29, TALAS 29) are 400.9mm plus travela2c:
    http://service.foxracingshox.com/con..._SPEC_RevA.pdf

    All Fox 36mm forks are 385.9mm plus travel a2c:
    http://service.foxracingshox.com/con..._spec_revb.pdf
    http://service.foxracingshox.com/con..._SPEC_RevA.pdf
    http://service.foxracingshox.com/con..._SPEC_RevA.pdf

    Fox 40mm forks (2007 & 2011):
    http://service.foxracingshox.com/con..._spec_revb.pdf
    http://service.foxracingshox.com/con..._SPEC_RevA.pdf

    Specs for all Fox shocks for 2007 to 2011 are available at the Fox Help tech info center:
    http://service.foxracingshox.com/consumers/index.htm
    Last edited by kirkbrode; 06-01-2011 at 09:36 PM.

  38. #38
    "El Whatever"
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    Quote Originally Posted by ronabrandt View Post
    529 according to BTI
    Confirmed, according to my tape measure.
    Check my Site

  39. #39
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    Quote Originally Posted by kirkbrode View Post
    Looking through all the spec sheets, it appears that the values do not change from 2007 to 2011 for Fox, so the values posted in this thread for Fox should be valid no matter what year you have (as long as its from 2007 to 2011).

    All Fox 26in 32mm forks (F-Series, FLOAT, TALAS, Vanilla) are 370.9mm plus travel a2c:
    http://service.foxracingshox.com/con..._SPEC_RevA.pdf
    I do not believe this is right, I am pretty sure that for a Fox 32 140 mm a-c is 525 mm if you rely on most of the geometry chart for bike with 140 mm forks equipped with Fox, it would be 511 iaw what you posted.

    I was looking for a Fox 150 mm too, might it be 535 mm?

  40. #40
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    Quote Originally Posted by crips View Post
    I do not believe this is right, I am pretty sure that for a Fox 32 140 mm a-c is 525 mm if you rely on most of the geometry chart for bike with 140 mm forks equipped with Fox, it would be 511 iaw what you posted.

    I was looking for a Fox 150 mm too, might it be 535 mm?

    I have seen those numbers before too.. (525mm a-c for a 140 mm travel shock) on bicycle manufacturer's geometry charts. I could be wrong but that may be for a fully extended/un-compressed fork (i.e. w/out sag), which is not a functional a-c length since that is not where the shock is when u ride the bike. And/or maybe the bike geometry charts include headset? I'm not sure where the discrepancy comes from.

    Did u look at the spec sheets provided by Fox? Fox's spec sheet says a-c (dimension A) for a 32mm fork w/ 140mm of travel is 510.9mm (370.9+140) +/- 5mm, and 520.9mm (370.9+150) for a 150mm travel fork. I assumed this is at sag, but not totally sure on that. Note 2 does say "based on medium rider weight air pressure setting". Pressure would make no difference for a fully extended/un-compressed shock, so there is slight implication that dimension A is at sag.

    Do not take my word for it. Look at the drawings and develop your own conclusions.

  41. #41
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    From Turner's website regarding the 2011 5.Spot geometry:
    "{ Listed geometry based on a 525mm axle to crown fork with a 26"x2.3" tire, acceptable fork travel range: 130-160mm }"

    Turner's 2011 build kits for the Spot include a Fox 150mm travel fork. This is where I saw 525mm, so it was for 150mm fork, not a 140mm. So the difference is only 5mm, and it falls w/in the 520.9 +/-5mm range. Anyway, I imagine Fox's engineering drawings are more precise than Turner's foot note is intended to be, so I'm sticking with 520.9mm for a Fox 32 150.

  42. #42
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    Quote Originally Posted by kirkbrode View Post
    I have seen those numbers before too.. (525mm a-c for a 140 mm travel shock) on bicycle manufacturer's geometry charts. I could be wrong but that may be for a fully extended/un-compressed fork (i.e. w/out sag), which is not a functional a-c length since that is not where the shock is when u ride the bike. And/or maybe the bike geometry charts include headset? I'm not sure where the discrepancy comes from.

    Very few manufacturers include sagged dimensions... and giving sagged dimensions can be argued as useable as everybody uses different sag and in the end, manufacturers may go for a happy medium or the max length in the industry. That is RS, whose forks are 10mm longer than Fox'

    Quote Originally Posted by kirkbrode View Post
    Did u look at the spec sheets provided by Fox? Fox's spec sheet says a-c (dimension A) for a 32mm fork w/ 140mm of travel is 510.9mm (370.9+140) +/- 5mm, and 520.9mm (370.9+150) for a 150mm travel fork. I assumed this is at sag, but not totally sure on that. Note 2 does say "based on medium rider weight air pressure setting". Pressure would make no difference for a fully extended/un-compressed shock, so there is slight implication that dimension A is at sag.

    Do not take my word for it. Look at the drawings and develop your own conclusions.
    Sag for a 140mm fork is 35mm @ 25%. So, a sagged 140mm fork that is 525mm A2C should be 487mm. So, it is definitively not a sagged dimension... unless they mean 10% that gives you 511mm.

    Fox Floats (I don't know and I don't want to guess for TALAS) have a coil negative spring. So, theoretically, if you pump enough you can compress the negative spring and hence, extend the fork. Worth the 10mm??? Who knows?

    I think Fox drawings should be correct (because frame manufacturers have to design around them) and they're indeed shorter. But best bet is for someone who has one of the thousands of units sold to date pulls out a tape measure and tell us which is correct.

    I did for my Revelation 150mm and it's inside tolerance for RS spec @ 530mm (527 is spec'ed)

    My 2008 160mm Nixon is 545mm. 5mm longer than spec'ed.
    Check my Site

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    It would still be awesome for someone who has one to pull out a tape measure and measure it, as Warp said.

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    To clarify this situation I sent an email to Fox and the reply was as follows:

    Fox 140mm: 510mm
    Fox 150mm: 520mm

    therefore I guess that 525mm for a 140mm fork is including headset lower stack height.

    So is there a difference of 19mm between a Fox 140mm and a RS Reveletion 150mm forks?

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    Quote Originally Posted by crips View Post
    To clarify this situation I sent an email to Fox and the reply was as follows:

    Fox 140mm: 510mm
    Fox 150mm: 520mm

    therefore I guess that 525mm for a 140mm fork is including headset lower stack height.

    So is there a difference of 19mm between a Fox 140mm and a RS Reveletion 150mm forks?
    Double verify the 140 Fox.

    I have a 2008 140mm Talas and I get 510 (511 could be) with forks at full extension. Fox is right on the money.
    2013 Banshee Spitfire V2 650b

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    The a/c of the 2010 Rock Shox Recon Race RL 26er is 470mm...according to the stats on my Black Forest from the Focus website.

  47. #47
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    Are the AC lengths for the 2011 RS Revelation 150 different between the 15mm axle and 20mm axle versions? Does anyone have the lengths handy?

  48. #48
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    I would imagine no difference in ac length between a 15 $ 20mm axle because you measure at the center of the axle.


    My question is how much does the wheel base change with the change in head angle? Anyone know?

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    Fork suggestion for an old SC Blur?

    New to the forum and looks like I found the right thread. Hoping maybe someone can suggest a fork (something a few years old that I might find online) for a 2002 Blur (I guess they call it a "classic" these days). I don't even know where to begin when it comes to sizing the thing, and I need something quick to replace the original Marz I bought it with (drop outs cracked), but don't want anything too spendy as I'm hoping to get a new bike in 6 months. Anybody have some advice? Thanks.

  50. #50
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    Quote Originally Posted by Noobi-Wan Kenobi View Post
    Good thread. How about some data on the cheaper forks that people would be upgrading from?? You've got the Darts covered, but how about Suntour, etc.
    Manufacturer: Suntour
    Model Year:2011
    Model:XCR-LO-29
    Travel:100mm
    Axle to Crown Length: 536mm

    I measured mine at 53 centimeters then found it listed here at 536 mm.
    SR Suntour XCR Suspension Fork 100mm 29" Black 1 1/8" Threadless - New York's Oldest and Largest Bike Store

    Good thing I found this thread. I was looking at ordering a 100 mm fox to replace it. It looks Like I may snag a Fox 29er Talas 140mm and be much closer to maintaining the original handling Characteristics

    Sounds like the statement about no need to list a cheap fork that someone would actually upgrade from was incorrect. If I simply went with a 100mm Fox thinking it would be close I would be like 40mm shorter.
    Marin 29er
    "Try not to ride too long you might end up burning muscle!"
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  51. #51
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    Quote Originally Posted by crips View Post
    To clarify this situation I sent an email to Fox and the reply was as follows:

    Fox 140mm: 510mm
    Fox 150mm: 520mm

    therefore I guess that 525mm for a 140mm fork is including headset lower stack height.

    So is there a difference of 19mm between a Fox 140mm and a RS Reveletion 150mm forks?
    I just measured several times Dimension "A" per the CAD drawing as shown here http://service.foxracingshox.com/con..._SPEC_RevA.pdf
    On my 2005 Float R 130mm Fork, I'm getting 510mm. The fork is off my bike and i'm a Land Surveyor, using a steel tape that measures in millimeters I also verified Dimension B and I'm getting 486mm

    My triple check was taking out all the air and compressing the fork till it bottoms out. I am getting 135mm of travel.

    Does this mean i actually have a 140mm fork and the "130mm" sticker is in error?? No wonder I lost the race!
    Last edited by liftmys10; 11-04-2011 at 09:02 PM.
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  52. #52
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    This thread gave me some insight into my issue. I have a Gemini tandem. Non-suspension corrected with a Judy DH. I want to replace this fork with something with disk brake and also would like to lower the front end, shorter axle to crown length. I did a crude measurement of the Judy DH and it appears to already be on the low side. Are there any options of finding a fork that is lower than 450?

  53. #53
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    anyone with the manitou drake 29er?

  54. #54
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    Lefty 100mm PBR A2C

    I´d like to upgrade my bike and assemble Lefty 100mm PBR on it. I was not able to find info about the axle to crown lenght for this fork, though. I´ve found that 110mm Lefty is 475mm. Do you think 100mm travel Lefty A2C lenght would be 465mm?

  55. #55
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    You can try to ask on that info some ebay seller. There is plenty of Lefty's for sale right now. Anyway, nice bike you riding! I just find your picture searching on mtbr. Did you find those ZTR 650 rims? May be I can help you wuth that. I'm riding 29er full suspension now and really like it! 650 wheels should fit almost any 26" frame if you use thiny tires.

  56. #56
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    How to figure out which A/C a frame was designed to use...

    I would be curious about interpreting the A/C measurement from a frame manufacturer. For instance, if I go to the geometry page at Salsa Cycles to read about the Dos Niner, it says: * Fork is not included. Fork measurements listed are for an average 80mm 29" suspension fork

    Then, in the geometry chart, they list the fork length measurement as 468mm. Not sure if their definition of "fork length" equates to what we are calling A/C in this thread.

    If I measure my 2008 Reba Race A/C from center of the skewer axle to the top of the crown on the backside, I get 489mm (which is about what others report for the REBA 29"er A/C 80mm fork - I've seen 486-489, but my year model 2008 is listed by RockShox with a 490mm "crown to axle" as RockShox calls it). If I measure to the bottom of the crown instead of the top, I get the 468mm. Whether that is coincidence or not with the 468mm Salsa "fork length" measurement - I don't know. By the way, my rigid Karate Monkey fork has an A/C of 468mm. So perhaps Salsa is using the "sagged" measurement for the "fork length".

    <a href="http://www.flickr.com/photos/7166535@N05/6646955123/" title="Dos Niner Geometry by BBcamerata, on Flickr"><img src="http://farm8.staticflickr.com/7013/6646955123_4eef3d2035_z.jpg" width="449" height="600" alt="Dos Niner Geometry"></a>

    I notice a Fox 80mm 29"er fork has about 9mm or so less in the A/C measurement compared to the 80mm REBA. And a similar difference between 100mm models (looks like about a 6-9mm difference based on who is measuring and which models).

    Last question. The chart above shoes the fork offset as 44mm, yet I run an older fork with 38mm of offset. If purchasing a newer fork, what changes would I notice running a fork with the newer offset (closer to the chart's number of 44mm that is) compared to the older 38mm offset?

    TIA on interpreting all of this for me.

    BB
    Last edited by BruceBrown; 01-06-2012 at 07:38 AM.

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    Manufacturer: Manitou
    Model Year:2011
    Model:Minute Pro
    Travel:100mm
    Axle to Crown Length: 475mm (my measurement)

    Manitou's published length is 478, so I'd say that's pretty accurate.

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    Manufacturer: Nishiki? I think RST or Suntour because its an elastomer fork.
    Model Year: 2003/4?
    Model: Bigfoot 29er
    Travel:80mm?
    Axle to Crown Length 18cm.
    Other info: Its the standard fork you get with a Z-29.

  59. #59
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    Quote Originally Posted by Wasmachineman NL View Post
    Manufacturer: Nishiki? I think RST or Suntour because its an elastomer fork.
    Model Year: 2003/4?
    Model: Bigfoot 29er
    Travel:80mm?
    Axle to Crown Length 18cm.
    Other info: Its the standard fork you get with a Z-29.
    You are measuring it wrong. Axle to crown height is the distance from the center of the wheels axle to the top of the fork crown (the point where it enters the frames head tube).

  60. #60
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    Lyric 170 555 mm

  61. #61
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    Any updates to this chart for modern shocks?

  62. #62
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    Specialized
    2007-2010
    Epic E100
    100mm
    Axle to Crown Length: 481mm (stock)

    Specialized
    2007-2010
    Stumpjumper S120
    120mm
    Axle to Crown Length: 501mm (stock)


    Specialized
    2007-2009
    Enduro SL
    150mm
    Axle to Crown Length: 541mm
    Custom Work: stock out of the box (note: dust wipers are not compatible with later E160 models)

    Specialized
    2007-2009
    Enduro XL
    150mm
    Axle to Crown Length: 545mm

    Specialized
    2010-2011
    Enduro E160
    160mm
    Axle to Crown Length: 541mm

    X-Fusion
    2010
    Vengance
    170mm
    Axle to Crown Length: 570mm

  63. #63
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    Thank you so much for doing this, it has helped me tremendously.

  64. #64
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    Quote Originally Posted by theskyking View Post
    Any updates to this chart for modern shocks?
    ?? There's a lot of modern forks listed, just 'cause the manufacture changes the stickers does not mean the length changes.

  65. #65
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    I thought I posted my compilation, but I didn't. Some forks are already listed but others are new. It took quite a bit of effort (and mixed results) calling, emailing and looking around for specifications. Standard rake/offset for suspension forks?

  66. #66
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    Anyone know the a2c of 2012 Lefty 29er XLR (100mm)? Much appreciated, thanks.

  67. #67
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    Quote Originally Posted by Juza72 View Post
    Anyone know the a2c of 2012 Lefty 29er XLR (100mm)? Much appreciated, thanks.

    The Cannondale 29er leftys are are revalved 120mm 26ers I believe. The 120mm is 490mm A2C.

    The 26" MAX PBRs and XLR's are not factory revalved, but can be revalved with a kit down to 110mm for 29ers and their A2C is 510mm.

  68. #68
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    shocks

    need help choosing a front shock, v brake compatilable, stiff and made for jumping, any advice would be helpfull

  69. #69
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    I'm saying hi so I can create a new thread specfic to me.

  70. #70
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    Extremely helpful.

  71. #71
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    Any rigid fork with 1" steerer, 430-450 a-c, and v-brake compatible?

    Thanks

  72. #72
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    2013 Rockshox XC 28 TK 80mm Travel, 29" wheel - 483mm

  73. #73
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    Measured 2009 Fox Talas 150 (15mm axle open bath).
    522mm
    It has additional 2-3 mm that you can force open, but they bounce back like some kind of negative spring.

  74. #74
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    2012 list of fork axle to crown lengths and rake

    This list is from frenk in the following post:
    Standard rake/offset for suspension forks?


    29" Forks
    ================================================== ====


    === Fox ===

    F29 80mm: 480.8/44
    F29 100mm: 500.8/44
    F29 120mm: 520.8/44

    F29 G2 100mm: 510/51
    F29 G2 80mm: 490/51


    === RockShox ===

    pre-2009 Reba 29 80mm: 489/38
    pre-2009 Reba 29 100mm: 509/38
    Reba 29 80mm: 486/46
    Reba 29 100mm: 506/46

    Reba 29 G2 80mm: ?/51
    Reba 29 G2 100mm: ?/51

    Recon 29 80mm: 486/46
    Recon 29 100mm: 506/46

    Revelation 29 120mm: 528/46
    Revelation 29 130mm: 538/46
    Revelation 29 140mm: 548/46

    SID 29 80mm: 486/46
    SID 29 90mm: 496/46
    SID 29 100mm: 506/46


    === Manitou ===

    Minute 29 80mm: 490/47.60
    Minute 29 100mm: 510/47.60
    Minute 29 120mm: 530/47.60

    Tower 29 80mm: 490/48
    Tower 29 100mm: 510/48
    Tower 29 120mm: 530/48

    === Bontrager ===

    Switchblade 29: 465/38


    === DT Swiss ===


    XMM 29 100mm: 503/45
    XMM 29 129mm: 523/45

    XRR 470: 470/42


    === RST ===

    M-29 80mm: 490/43
    M-29 100mm: 510/43


    === Marzocchi ===

    Corsa SL 29 80mm: 489.2/44
    Corsa SL 29 100mm: 509.2/44
    Corsa SL 29 120mm: 529.2/44

    Corsa SL LR 29 80mm: 491.5/44
    Corsa SL LR 29 100mm: 511.5/44
    Corsa SL LR 29 120mm: 531.5/44

    Corsa SL RC 29 80mm: 489.2/44
    Corsa SL RC 29 100mm: 509.2/44
    Corsa SL RC 29 120mm: 529.2/44


    === Niner ===

    Carbon Rigid: 470/45
    pre-2009 Carbon Rigid: 490/39

    Steel Rigid: 470/45
    pre-2009 Steel Rigid: 490/39


    === Surly ===

    Karate-Monkey: 468/43


    === Cannondale ===

    Lefty 100mm: 470/46
    Lefty 110mm: 475/46
    Lefty 130mm: 500/46
    Lefty 140mm: 510/46


    === White Brothers ===

    Rock Solid 425: 425/44
    Rock Solid 445: 445/44
    Rock Solid 465: 465/44

    Loop 80mm: ?/?
    Loop 100mm: ?/?
    Loop 110mm: ?/?
    Loop 120mm: ?/?
    Loop 130mm: ?/?
    Loop 140mm: ?/?

    Snowpack 450: 450/?
    Snowpack 468: 468/?

    Groove 180mm: ?/?
    Groove 200mm: ?/?

    Magic 80mm: ?/?
    Magic 110mm: ?/?

    Fluid 110: 503/44
    Fluid 135: 528/44
    Fluid 150: 543/44

    IMV 80mm: 480/44
    IMV 100mm: 500/44

    F135 135mm: 535/43


    === Salsa ===

    CroMoto Grande 29er (80mm-corrected): 468/45
    Enabler: 468/45


    === Pace ===

    RC29 100mm: 510/40


    === Vassago ===

    Odis: 467/45


    === Maverick ===

    DUC32 115mm: 520/47.3
    SC32 86mm: 494/39.7


    === Vicious Cycles ===

    29" rim brake: 470/38


    === SR Suntour ===

    Epicon 100mm: 516/?
    XCR 80/100mm: 481/?
    XCT V3 80mm: 379/?
    XCT V3 100mm: 382/?


    === On One ===

    Carbon 29er Race: 450/38
    Carbon Superlight (alu crown): 470/47
    2 wheels

  75. #75
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    '13 RockShox SID RCT3 Solo Air Fork 120mm 29" A-C is ???

    Various retail sites list it as 506, but also have the 100mm as 506

  76. #76
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    Ive checksd a couple of sites and they have the axle to crown listed as 525mm.

  77. #77
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    Do you know the AC of a Float 34 2014 in 160 mm ?

    Thanks

  78. #78
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    Any data on the 150mm variant of RockShox Sektor?

  79. #79
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    nm, figured it out: the 15mm axle 150mm travel variant is spec'd at 529 +/- 5mm.

  80. #80
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    Anyone have Rock Shox link to A to C lengths for all their forks?

  81. #81
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    Quote Originally Posted by Fat Urkel View Post
    Anyone have Rock Shox link to A to C lengths for all their forks?
    All Specification Sheets | Bike Help Center | FOX

    For a 27.5 wheel, I want to compare the Pike, Fox 32 and 34, and MRP for 120mm and 130mm fork travels to install on the Pivot Mach 4 medium I have on order. I am interested in comparing weight and axle-to-crown length mostly.

    For MRP I can only find their main page, which only says "WEIGHT: 4.3 lbs. for 26/27.5", 4.4 lbs. for 29"; AXLE-TO-CROWN HEIGHT: 553mm for 170mm 26/27.5", 558mm for 150mm 29."

    For Pike this is all I can find so far: 1861g (4.10 lb)

  82. #82
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    Hi, does anyone know what the Mazzorchi 350 (27.5/160mm) forks A2c height is?

  83. #83
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    Im looking to get a new pair of downhill forks for my bike but i have to get a thru bolt hub for my front wheel. They state that the crown pitch is 140mm but i have no idea what length hub I need to get; a 110mm hub, 100mm hub?

  84. #84
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    === White Brothers ===

    Loop TCR 29er 80mm: 489mm
    Loop TCR 29er 100mm: 509mm
    Loop TCR 29er 120mm: 529mm
    Loop TCR 29er 130mm: 539mm
    Loop TCR 29er 140mm: 549mm

    From here, with rakes etc. specs all there too:
    http://www.cyen-bicycles.com/files/L...IST-Sheet1.pdf

  85. #85
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    Hi guys I havea doubt.
    Right now I have a 2009 Rock Shox SID Race 26' 100mm. I would like to trade it for a Magura TS8 100mm.
    Right now the 27.5' prices are cheaper than 26. The axle crown difference is 13mm.
    Do you think it will hurt? My frame is a 2012 Trek Elite 9.9SSL
    I don't plan on converting it to 27.5' (at least for now).

  86. #86
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    Pocket typing

    Deleted
    Last edited by CarolinaPanthers; 04-14-2017 at 12:37 PM.

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    edit
    Last edited by Jarvismcjiggle; 04-16-2017 at 03:54 PM.

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