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  1. #1
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    Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compatibility

    Please add to this or recommend corrections as it is just a response to multiple questions regarding what will work in what.

    First in formost you must determine what your frame takes. There are 4 primary options at this point. I am not including the other threaded options or BMX standards as they are rare for mountain bikes and most that have them probably wont need this help


    1. BB30 - 30mm inner diameter bearings, Bearing fits directly in to the frame



    2. PF30 (Press Fit 30) - 30mm inner diameter bearings, Bearing sits in a pressed in cup



    3.Press Fit, BB90, BB92, BB95 24mm inner diameter bearings, pressed cup bearing



    4. English Threaded Bottom Bracket - This is the old threaded standard shell that takes outboard 24mm inner diameter bearings, square tapered and splined bottom brackets



    If you have option 1 or 2 any 30mm crank will fit, it doesnt matter if its marketed as a BB30 or PF30 crank.


    Also if you have bottom bracket 1 or 2 you can use a BB30 adapter like this.

    This adapter allows you to use 24mm shaft cranks including: Shimano Hollow Tech II, FSA Mega Exo and Race Face X-Type. They are used in tandem with your existing bottom bracket. These adapters wont work with Sram GXP cranks as far as I know.


    If you have bottom bracket 3 you can only use 24mm shaft cranks. Shimano Hollow Tech II, FSA Mega Exo and Race Face X-Type are all interchange with each others bottom brackets. Sram GXP uses its own Press Fit bottom bracket.


    Bottom bracket 4 is much like bottom bracket 3 in that Shimano Hollow Tech II, FSA Mega Exo and Race Face X-Type all use interchangeable bottom brackets but Sram GXP takes its own bottom bracket. As stated above this bottom bracket shell (the bike) will also take the older standards.

    Hopefully this is helpful and doesn't just add to the confusion.
    Progression or marketing, most likely a little of both. Oh how I loath thee, bicycle industry.
    Last edited by e-luder; 12-30-2011 at 12:47 AM.
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  2. #2
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    Excellent thread, nice work Ronabrandt!

  3. #3
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    This is, quite simply, AWESOME
    Just the info I've been looking for

    Now for the silly question:

    If I wanted to use a square taper crank (don't ask why; kidding... this is for a friend), would the Velo Orange threadless BB work on a PF30 frame (2011 Giant XTC)? My friend mistakenly bought the frame as an upgrade to his ATX, thinking he could just switch all of his parts over to the new frame. He's new to MTBing and was not aware of all the different "standards" in BBs nowadays.

    He doesn't really want to change his drivetrain as it would be too costly. Since he's currently on 8-speed, if he has to change his crankset to fit the BB, he has to change out his entire drivetrain!

    So I'm doing some research for him to check out his alternatives.

    Any input would be very much appreciated

    And Happy New Year btw
    Better to have and not need it, than to need it and not have it.

  4. #4
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    That wont work unfortunately. It is for threaded bottom brackets like bottom bracket 4. It is a cool solution for weird threads or ruined threads. There are BB30 9 speed crank sets available, and they will work with his 8 speed drive train. His cheapest option may be to get a BB30 bottom bracket, and some adapters like pictured above. Then just get some 9 speed 24mm shaft cranks. Either way its cheaper than a entire drivetrain.
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  5. #5
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    Quote Originally Posted by ronabrandt View Post
    That wont work unfortunately. It is for threaded bottom brackets like bottom bracket 4. It is a cool solution for weird threads or ruined threads. There are BB30 9 speed crank sets available, and they will work with his 8 speed drive train. His cheapest option may be to get a BB30 bottom bracket, and some adapters like pictured above. Then just get some 9 speed 24mm shaft cranks. Either way its cheaper than a entire drivetrain.
    I figured as much. Thanks for that.

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  6. #6
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    Excellent thread... I need to clear up a little dilemma, maybe you can help:

    My 2012 Pivot 5.7 has an X9 GXP crank and the frame uses a press-fit BB92 bottom bracket. I'm planning on upgrading the Pivot, so I want to use that X9 crank on a new 29er build that uses "standard 73mm threaded BB" bottom bracket; to do this would I just need to get a GXP threaded BB for the 29er to have everything bolt on? Which also makes me wonder if you can swap GXP cranks back and forth as long as the bottom brackets are also GXP (threaded, BB92)?

  7. #7
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    r1Gel,

    Truvativ makes a PF30 adapter that should work for your friend's need.

    BTI | Truvativ BB-shell adapter kit, PF30 to BSA (threaded) - 68/73mm

  8. #8
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    They are bottom bracket FITMENTS. There is only one standard that's why its called a standard!

  9. #9
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    I wonder about the FSA/Shimano compatibility.
    I just swapped a FSA crank from my 2009 Kona Unit with a SLX from another bike.
    My intention was just to swap cranksets.
    When I tried to install the FSA in the other bike with the SLX bottom bracket, it was tight going through the first bearing, had to use a dead blow hammer just a bit. However, when I went to seat the crankset fully in the bearings, I couldn't do it. I used the dead blow hammer but it wouldn't fully seat, at least 1/4" of shaft still out of the bearing - I was afraid to do it too much in case I wouldn't be able to get it back out.
    I should have checked with my calipers but just swapped bottom brackets. Everything went together easy after I did that.
    And yes, the bottom bracket had been faced and chased. Wonder if it was just tolerance stacking or if there is a slight difference.

    Oops, didn't notice it was a zombie thread.

  10. #10
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    Quote Originally Posted by Slash5 View Post
    I wonder about the FSA/Shimano compatibility.
    I just swapped a FSA crank from my 2009 Kona Unit with a SLX from another bike.
    My intention was just to swap cranksets.
    When I tried to install the FSA in the other bike with the SLX bottom bracket, it was tight going through the first bearing, had to use a dead blow hammer just a bit. However, when I went to seat the crankset fully in the bearings, I couldn't do it. I used the dead blow hammer but it wouldn't fully seat, at least 1/4" of shaft still out of the bearing - I was afraid to do it too much in case I wouldn't be able to get it back out.
    I should have checked with my calipers but just swapped bottom brackets. Everything went together easy after I did that.
    And yes, the bottom bracket had been faced and chased. Wonder if it was just tolerance stacking or if there is a slight difference.

    Oops, didn't notice it was a zombie thread.
    Shimano runs a -0/+.xxx tolerance and FSA is the reverse. If your lucky they will work together but more often than not they clash.

  11. #11
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    First post here. Since this is a bottom bracket guide, I have a 2012 Giant trance x3 and I was planning to buy a new crankset. Currently, the bike has a Deore crankset with pressfit BB. I was looking to upgrade to the truvativ X0 which is bb30. Do I will get any issues? Thanks in advance and looking forward to post more often.

  12. #12
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    In a thread like this, I just have to give a shout to Praxis Works and their Conversion Bottom-Bracket:

    Praxis Works | Conversion Kit

    There's no better solution for running 24mm Hollowtech cranks on a BB30 or PF30 frame. For that matter, it's a good solution period, and possibly better than running anything press fit.

  13. #13
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    Quote Originally Posted by Aortiz View Post
    First post here. Since this is a bottom bracket guide, I have a 2012 Giant trance x3 and I was planning to buy a new crankset. Currently, the bike has a Deore crankset with pressfit BB. I was looking to upgrade to the truvativ X0 which is bb30. Do I will get any issues? Thanks in advance and looking forward to post more often.

    That won't work. You can either stick to a Shimano, Raceface X-Type, or FSA Mega-Exo crank and save the bottom bracket, or go with a Sram GXP crank and get a new BB to go with it. BB30 is not compatible with your frame.

  14. #14
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    Any chance we could get this cleaned up and stickied before it disappears off page 5?

  15. #15
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    Also, there is the e13 threaded BB with 30mm bearings for option 4

  16. #16
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    Subscribed!!! This is the Thread I've been looking for...

  17. #17
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    Quote Originally Posted by Aortiz View Post
    First post here. Since this is a bottom bracket guide, I have a 2012 Giant trance x3 and I was planning to buy a new crankset. Currently, the bike has a Deore crankset with pressfit BB. I was looking to upgrade to the truvativ X0 which is bb30. Do I will get any issues? Thanks in advance and looking forward to post more often.
    Maybe a bit late to help with your particular situation, but wanted to post up about the possibility to run a BB30 mountain crank in press-in BB92 BB shell: BB92 TO BB30 BOTTOM BRACKET KIT
    Attached Thumbnails Attached Thumbnails Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compatibility-bb9230cs_600.jpg  

    Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compatibility-bearing_pressed2_700.jpg  

    Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compatibility-nondrive_installed_800c.jpg  


  18. #18
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    I've searched through the forums and haven't found an answer, so I'll try it here. I have a 2010 Trek Remedy that uses a Shimano M542 (Hallowtech 2) crank with a BB50? bottom bracket. I've got some SRAM BB30/PF30 cranks that I'd like to use, if possible. Do I just need to buy a BB30 bottom bracket or is this something I'm missing? I'm wondering if its really that simple and I'm overcomplicating it in my head... Thanks in advance!

  19. #19
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    Quote Originally Posted by mayonays View Post
    I've searched through the forums and haven't found an answer, so I'll try it here. I have a 2010 Trek Remedy that uses a Shimano M542 (Hallowtech 2) crank with a BB50? bottom bracket. I've got some SRAM BB30/PF30 cranks that I'd like to use, if possible. Do I just need to buy a BB30 bottom bracket or is this something I'm missing? I'm wondering if its really that simple and I'm overcomplicating it in my head... Thanks in advance!
    BB 30 won't work in your frame. You can convert from the wider BB30 shell down to a 24mm spindle, but not the other way around. Also the bearing spacing on your frame is too wide for a BB30 spindle to fit through.
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  20. #20
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    Question - I just bought a FSA crankset that comes with a Ceramic BB30 BB. I'm getting a frame that uses PF30.
    I know PF30 fits in ~46mm shell, and BB30 bearings fit in ~42mmshell.

    Is there an off chance that the BB30 bearings fit the PF30 plastic housing? If so, I'll buy a cheaper PF30 BB and swap the nicer ceramics into the housing.

  21. #21
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    Pretty sure BB30 and PF30 bearings are identical. Not sure how easy it will be to do the swap without damaging the housing though.

  22. #22
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    Then there is this thing I plan to use the 47 mm adaptors with a BB 30 crank. DSC02724 | Flickr - Photo Sharing!
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  23. #23
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    I have a Salsa Spearfish with a PF30 bb. It has a Sram PF30bb and I am using the wheels manufacturing adapters shown in the OP with a Race Face Turbine 2x10 crank. It works but its vary tight. There is too much compression on the BB and it wont spin with out resistance. It works but I don't expect the BB to last long. The better way to go for Race Face cranks is there adapter BB if you can find it.

    Race Face 2013

    I have herd good things about the Parlee adapters.

  24. #24
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    I have a 2013 Trek Rumblefish that has press fit bottom bracket for a Sram crank will a Shimano Xt hallowtech fit in this bottom bracket? Any body have a Rumblefish here that can help Thanks

  25. #25
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    Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compatibility

    Xt hollow tech cranks use a 24mm spindle where press fit and bb30 use 30mm, so no it won't work.

    You can get adapters that plug into your pf30 bb that will allow the simanos to work though. Or you can replace the whole bb with one of the complete units that have been mentioned in this thread.

    Sent from my cm_tenderloin using Tapatalk 2

  26. #26
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    Great thread...but. I've got an X9 crank that came out of a GXP BB shell from a Trek X-caliber. I'd like to use the crank on one of Trek's new Stache frames, which uses a press-fit bearing. Problem is I don't know and can't find reference to whether it is PF30, or what. Any help would be appreciated.

  27. #27
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    Measure the diameter of the bottom bracket on the bike. Each of the standards has a different diameter.

  28. #28
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    Quote Originally Posted by BlackMamba2012 View Post
    I have a 2013 Trek Rumblefish that has press fit bottom bracket for a Sram crank will a Shimano Xt hallowtech fit in this bottom bracket? Any body have a Rumblefish here that can help Thanks
    That is a "BB92." It's also called "BB91" and is also the same as "BB89.5". Basically means it's a press fit mountain standard with a BB shell ID of 41mm. Since SRAM is 24mm one side and 22mm on the other side, you can't just put a Shimano crank set into the same BB. You would need a replacement BB from Shimano in the BB92 standard or an aftermarket version. The part number for the standard Shimano-manufactured version is BB71-41A. We have several aftermarket versions with various bearing options here: PRESS-IN BOTTOM BRACKETS, CERAMIC HYBRID

  29. #29
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    Quote Originally Posted by mhopton View Post
    Great thread...but. I've got an X9 crank that came out of a GXP BB shell from a Trek X-caliber. I'd like to use the crank on one of Trek's new Stache frames, which uses a press-fit bearing. Problem is I don't know and can't find reference to whether it is PF30, or what. Any help would be appreciated.
    The Stache uses the "BB91/BB92/BB89.5" standard. In other words, 41mm inside diameter BB shell that uses press-in cups. You would need either a SRAM-manufactured "Pressfit GXP Adaptor, Mountain" or an aftermarket version like those we offer here: PRESS-IN BOTTOM BRACKETS, CERAMIC HYBRID. You would need to select a "GXP" option as opposed to a "HT2" option.

  30. #30
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    Hi All,
    Praxis here, and thanks for all the emails about this thread and the questions about our Conversion BB for Shimano cranks. We're doing everything we can to stay on top of demand so thanks for your patience...and yes...more versions for other cranks are coming soon.

    We simply wanted to make a PROPER BB and not a spacer/adaptor. Our unique design seems to have struck a chord with riders/mechanics and we're glad to help people out with a real solution for a rock solid BB for Shimano cranks on BB30, PF30, or the Specialized ROAD frame OSBB.

    Updated Product Page link here : Praxis Works | Conversion Kit Raw YouTube video also there of full explanation from the floor at Core Bike Show in UK.

    If any other questions feel free to email from our Contact page email.
    Thanks,
    Adam@PraxisWorks
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  31. #31
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    Where can I find a list of bikes that use BB30? Other than Cannondale. Google doesn't help.
    Last edited by Thatshowiroll; 03-12-2013 at 11:03 AM.

  32. #32
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    Wow, I just checked in on this thread since a lot of great products have become available to make cranks a little more cross compatible. Sorry to those that didnt get there questions answered.

    Unfortunately I cant edit my op, reading it after all this time showed me some points of confusion.
    Last edited by e-luder; 04-09-2013 at 11:18 PM.
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  33. #33
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    Some more quick references

    Frame bottom bracket shell inner diameter measurements

    BB30 Shell Diameter: 42mm
    PF30 Shell Diameter: 46mm
    BB86/92 (press-fit) shell Diameter: 41mm

    Also I should clarify that BB90/95 are not the same as BB86/92. It is/was only used by Trek in there carbon frames as far as I know and essentially uses the bearings from the BB86/92 bottom brackets with out the plastic cups. Much like a BB30 is a to PF30. For the record it has a 37mm Shell Diameter so a quick measurement will tell you if you have this or not.
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  34. #34
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    I am working on a bike for my daughter. It's a 34cm Ghost that has a PF30 BB shell. I am planning on running a short 140mm crank in a 1x10 set up until she grows and can be updated to a 165mm crank. What this means is I am stuck with using a Square taper or Isis bottom bracket foe right now. With the current adaptor posted in this thread I should be able to run an Isis BB in my PF30 frame so the short BMX cranks can be used, correct? If this is the case, what width of Isis bottom bracket should I use?

  35. #35
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    I'm working on upgrading my bike (even more than it is), and am trying to find measurements for the bb and cranks. It's a 2012 Giant Trance X4 and I'm trying to see if I can fit a Shimano Zee or Saint groupset to it. Any help would be great.

    And one quick question that I haven't been able to find any answers for... Would I be able to fit a threaded bb to my bike? It has a press fit currently, and it's been a b**** trying to make a 1x set up work on it.

    Thanks in advance!

  36. #36
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    You want the threaded BB to mount a chain guide? I'm not sure if/how that would work with any of the adapters out there. I would instead suggest getting a clutch type rear mech and one of these chainrings:
    wolftoothcycling.com
    Race Face 2013

  37. #37
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    That's what I had planned on doing, I was just curious if it could be done and work properly with a chain guide. Thanks!

  38. #38
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    Anyone have experience with the Race Face BB adapter for PF30 frames? I have always ridden and raced on RF Turbines. Building up a Niner Air 9 that has 73mm width PF30 interface. I see that RF makes their own BB to fit to be able to run their cranks. Just not sure how durable or good the adapter is. I have had my share of bombproof RF BBs and really crappy RF BBs as they made new ones to fit the external bearing cranksets. Just hoping for some feedback from someone who has tried it.

  39. #39
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    XX1 BB30 installed in 68mm BSA BB

    I'm running XX1 BB30 crank in my old-school steel frame.

    Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compatibility-photo-2.jpg

    The XX1 BB30 crank's axle measures ~89mm without the bearing preloader. 68mm BB faced at local shop, measures at 68.3mm.
    I bought external BB30 BSA threaded bottom bracket bearing cups from Enduro. Each bearing cup measures ~10mm, so with BB and cups, total came to ~88mm. I installed the NDS arm minus the preload adjuster. Sure enough, the crank interface barely clears the bearing cup. I installed the DS without any spacers and torqued it to spec. Chainline measures at 49mm per SRAM. The crank spins freely without any drag or play. I've been running this setup without any issues.
    Last edited by ibis315; 10-04-2013 at 10:01 PM.

  40. #40
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    Octalink BB 1995 GT Zaskar

    I have a 1994 GT Zaskar frame (based on the serial number). I am trying to install an XTR octalink bottom bracket. Everything I'm reading says 73x107mm, but I cannot find such size in octalink. Is there anyone that knows the solution to this problem?
    Last edited by iambill; 10-31-2013 at 04:41 PM. Reason: Incorrect reply-to

  41. #41
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    Quote Originally Posted by FoolCyclist View Post
    Anyone have experience with the Race Face BB adapter for PF30 frames? I have always ridden and raced on RF Turbines. Building up a Niner Air 9 that has 73mm width PF30 interface. I see that RF makes their own BB to fit to be able to run their cranks. Just not sure how durable or good the adapter is. I have had my share of bombproof RF BBs and really crappy RF BBs as they made new ones to fit the external bearing cranksets. Just hoping for some feedback from someone who has tried it.
    I switched to one on my Salsa frame before I had to Warranty it. I had a few problems pressing it in. It wouldn't go straight in it kept getting cocked in the frame. I got it in after a lot of fussing with it. Once my frame was warranted I had a hell of a time getting the BB out. It presses in so tight that I tore it up quite badly trying to get it out. When I tried to get in in the new frame I had the same problem it wouldn't go straight. It ended up damaging the BB shell on the frame. I trashed it and went to the plastic SRAM press in adapter to run a normal raceface BB. In concept its nice but in practice its not so nice. The outside of the BB needs to be plastic not metal so you can't damage your frame trying to press it in.

  42. #42
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    Quote Originally Posted by iambill View Post
    I have a 1994 GT Zaskar frame (based on the serial number). I am trying to install an XTR octalink bottom bracket. Everything I'm reading says 73x107mm, but I cannot find such size in octalink. Is there anyone that knows the solution to this problem?
    113 is the shortest overall spindle I think you can get in an octalink. 3mm per side won't matter since you're going a little wider anyway, and I'd bet the Q factor on Octalink cranks has a narrower profile to compensate for the larger crank to spindle interface.

  43. #43
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    Thank you for that information. In addition, so I've discovered, Shimano 105 octalink comes in 109.5mm, but I will try out a cheap 113 before I go all out on the XTR BB. Thanks for your input! Happy trails!

  44. #44
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    Quote Originally Posted by Praxis Works View Post
    Hi All,
    Praxis here, and thanks for all the emails about this thread and the questions about our Conversion BB for Shimano cranks. We're doing everything we can to stay on top of demand so thanks for your patience...and yes...more versions for other cranks are coming soon.

    We simply wanted to make a PROPER BB and not a spacer/adaptor. Our unique design seems to have struck a chord with riders/mechanics and we're glad to help people out with a real solution for a rock solid BB for Shimano cranks on BB30, PF30, or the Specialized ROAD frame OSBB.

    Updated Product Page link here : Praxis Works | Conversion Kit Raw YouTube video also there of full explanation from the floor at Core Bike Show in UK.

    If any other questions feel free to email from our Contact page email.
    Thanks,
    Adam@PraxisWorks
    Adam your design is brilliant, I will be ordering one the minute I get my frame..

    What kind of channels do you have to order one, LBS, direct...??

  45. #45
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    Just to clarify:
    Current setup is a BB92 bottom bracket with a Raceface Evolve crankset.
    Assuming I intend to use a modern non-BB30 or non-PF30 based crankset. My options to change crankset are:

    1. Keep the Bottom Bracket in place and replace with any Shimano or Raceface crankset with 24mm spindle.

    2. Get a Sram/Truvative GXP BB92 bottom bracket. Then get any Sram/Truvativ standard crankset (ie non-BB30).

    3. Do something elaborate with adaptors from 3rd party vendors and try to use a weird combination of cranks and expensive bottom brackets.

    Spindle lengths don't matter? It's never listed in an item description.

  46. #46
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    Quote Originally Posted by jm2e View Post
    Just to clarify:
    Current setup is a BB92 bottom bracket with a Raceface Evolve crankset.
    Assuming I intend to use a modern non-BB30 or non-PF30 based crankset. My options to change crankset are:

    1. Keep the Bottom Bracket in place and replace with any Shimano or Raceface crankset with 24mm spindle.

    2. Get a Sram/Truvative GXP BB92 bottom bracket. Then get any Sram/Truvativ standard crankset (ie non-BB30).

    3. Do something elaborate with adaptors from 3rd party vendors and try to use a weird combination of cranks and expensive bottom brackets.

    Spindle lengths don't matter? It's never listed in an item description.
    Since right up front you excluded any crankset with a 30mm spindle, I'm not sure why you list option number 3 about elaborate adapters. What's to adapt to? I you are running a Shimano (or RF) crank, standard BB92 is fine. If you are running a GXP crank, BB92 for GXP is fine. You already defined the cranksets. Even sticking with those two types of cranks (HT2 and GXP), you still have many BB options (aluminum cups vs. plastic) and many bearing options. You can see some of the many BB92 options (both HT2 and GXP) here: PRESS-IN BOTTOM BRACKETS, CERAMIC HYBRID. Of course these are our offerings. There are many other options from other manufacturers as well.

  47. #47
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    Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compat...

    Quote Originally Posted by jm2e View Post
    Just to clarify:
    Current setup is a BB92 bottom bracket with a Raceface Evolve crankset.
    Assuming I intend to use a modern non-BB30 or non-PF30 based crankset. My options to change crankset are:

    1. Keep the Bottom Bracket in place and replace with any Shimano or Raceface crankset with 24mm spindle.

    2. Get a Sram/Truvative GXP BB92 bottom bracket. Then get any Sram/Truvativ standard crankset (ie non-BB30).

    3. Do something elaborate with adaptors from 3rd party vendors and try to use a weird combination of cranks and expensive bottom brackets.

    Spindle lengths don't matter? It's never listed in an item description.
    All correct, though I would get an Enduro BB92 bottom bracket. Available for Shimano style or SRAM GXP cranks.
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  48. #48
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    Quote Originally Posted by Chris2fur View Post
    Since right up front you excluded any crankset with a 30mm spindle, I'm not sure why you list option number 3 about elaborate adapters. What's to adapt to?
    All I'm trying to do is get a Sram X9 crankset so that I can start experimenting with a spiderless chainring system. Just want to make sure I'm not buying the wrong parts.
    Since the world of bottom brackets and cranksets is confusing to me, I don't know what would need adapting too. I just now realized that a Sram BB30 crank won't go into a Sram BB92 bottom bracket because the spindle is too thick. Since the expensive and confusing bottom bracket adapters keep coming up, I thought maybe there was something else I needed to know before jumping in. Since I can get a Sram BB92 bottom bracket for $35 I'm not sure why I'd go with a 3rd party, but please do enlighten me.
    Thanks for all the help.

  49. #49
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    Quote Originally Posted by jm2e View Post
    All I'm trying to do is get a Sram X9 crankset so that I can start experimenting with a spiderless chainring system. Just want to make sure I'm not buying the wrong parts.
    Since the world of bottom brackets and cranksets is confusing to me, I don't know what would need adapting too. I just now realized that a Sram BB30 crank won't go into a Sram BB92 bottom bracket because the spindle is too thick. Since the expensive and confusing bottom bracket adapters keep coming up, I thought maybe there was something else I needed to know before jumping in. Since I can get a Sram BB92 bottom bracket for $35 I'm not sure why I'd go with a 3rd party, but please do enlighten me.
    Thanks for all the help.
    You are so right on the confusion. BB "standards" have exploded over that last few years. I hope I don't add to the confusion by telling you that, in some cases, a BB30 crank can be run in a BB92 shell (BB92 TO BB30 BOTTOM BRACKET KIT). This would be one of those times when spindle length does matter--since not all BB30 MTB cranks do have long enough spindles to make the conversion. Unfortunately, as you pointed out earlier, this info is rarely offered by manufacturers.

    As far as your question about why you might consider a 3rd party BB, it is really a question of performance. It's mostly related to friction reduction. Some options also offer greater longevity and greater corrosion resistance.

  50. #50
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    Bottom Bracket Standards - a guide to BB30, PF30, and Outboard Bearing compat...

    Quote Originally Posted by jm2e View Post
    All I'm trying to do is get a Sram X9 crankset so that I can start experimenting with a spiderless chainring system. Just want to make sure I'm not buying the wrong parts.
    Since the world of bottom brackets and cranksets is confusing to me, I don't know what would need adapting too. I just now realized that a Sram BB30 crank won't go into a Sram BB92 bottom bracket because the spindle is too thick. Since the expensive and confusing bottom bracket adapters keep coming up, I thought maybe there was something else I needed to know before jumping in. Since I can get a Sram BB92 bottom bracket for $35 I'm not sure why I'd go with a 3rd party, but please do enlighten me.
    Thanks for all the help.
    Just get the X9 GXP crankset. Be sure you buy the GXP versions of the direct mount rings. Not the same as the BB30 rings.

    The Enduro BBs have much nicer bearings and the bearing are replaceable at a reasonable cost. I think you do not even need to remove the cups to do that. Chris?
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