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  1. #1
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    Anyone install Fox RP23 Shim/Volume Spacer on Mojo?

    Has anyone played with either Fox shims or homemade ones (like DG's from Turner's forum)? I found myself using up a lot of the low/middle part of the travel on my SLR, so I thought about shimming it. Maybe the small sized one and lower the air pressure. BTW 2011/12 Turner Spots come with medium shims already installed. Here's a writeup for those who are unfamiliar:

    Tech Tuesday - How to Install a Fox Float Air-Volume Spacer - Pinkbike.com

    I haven't opened up my RP23, but I assume there are no shims in there currently.

    If Hans or Dave Weagle can chime in, that would be great too!

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    Don't need hans or anyone else to chime in, alot of people have done it. There are multiple threads about the rp-23 blowing through it's travel too easily. put the medium spacer in mine. (mojo HD) an now running right about my body weight for pressure and not bottoming out and right at 30% sag....
    Full time rider part time racer...

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  3. #3
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    I'm having problems trying to get the air spacer kit in Australia and I don't want to spend $40 on postage to get it. Could someone who has one give me the basic dimensions, ID,OD and the wall height and thickness of the larger spacer. Then I can cnc some out of hdpe.

  4. #4
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    You can use CD packaging, among other materials. Check out DG's write up in the Turner forum. Search using "shim" or RP23, etc.

  5. #5
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    Quote Originally Posted by Cable0guy View Post
    You can use CD packaging, among other materials. Check out DG's write up in the Turner forum. Search using "shim" or RP23, etc.
    I used the plastic from a CD/DVD container. Works well. Make a set of shims and pick the one that works best.

  6. #6
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    I have read the turner forum. The spacers they make seem to have a lot less volume than the .6 cubic inch fox spacer. I should probably just open the shock up and make my own measurements.

  7. #7
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    The shaft in the rp23 is 10mm so the ID of the spacer should match that.... but you're right, you should measure it. I put the med Fox spacer in mine and it was a big improvement... never had a reason to measure the diameter of them though. If nobody else answers you I can measure one next week when I'm back home.

    EDIT: I'm just remembering that the volume reducer spacers from Fox are designed to fill the void in the top of the shock body without changing total travel, and as such they don't snap onto the shock shaft at all (that was the 10mm diameter I was referring to). Anything that goes onto the shaft itself will mechanically limit the travel by causing the shock to bottom sooner against the spacer. The Fox spacers are contoured to snap onto the base of the shaft up in the top of the shock body...so it's larger diameter then 10mm, and from memory I'm thinking it may have a beveled shoulder or slight taper to it.

    Personally, I think the clean execution, reasonable price (relative to a lot of bike stuff), choice of 3 included sizes, and noticeable benefit all argue in favor of just buying the fox kit... and I'm generally a DIY kinda guy. Of course, if I had access to a CNC mill I'd probably feel differently about a lot of things
    Last edited by doismellbacon; 02-09-2012 at 01:04 PM.

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    Thanks doismellbacon,

    I was just worried about the OD mainly as it seems to be quite a bit smaller than ID of the
    air can, so I thought it must have to clear something and I just wanted to play it safe.

  9. #9
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    The easiest and cheapest way to do it is to slide the outer chamber off and install a home made shim in there. Some will say they don't trust it, blah blah blah. There isn't anything to not trust, you're just reducing the volume of the can(most importantly when its under full compression). Period. And no, there's no way this mod would increase the heat of the shock any noticeable amount; Its not compressing the gasses enough to cause that, and its not interfering with any moving parts.

    Link to instructions here: DW 5 Spot RP23 mod

  10. #10
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    See my edit above.

  11. #11
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    Quote Originally Posted by Tim-H View Post
    The easiest and cheapest way to do it is to slide the outer chamber off and install a home made shim in there. Some will say they don't trust it, blah blah blah. There isn't anything to not trust, you're just reducing the volume of the can(most importantly when its under full compression). Period. And no, there's no way this mod would increase the heat of the shock any noticeable amount; Its not compressing the gasses enough to cause that, and its not interfering with any moving parts.

    Link to instructions here: DW 5 Spot RP23 mod
    Umm what if you dont have a HV shock, ie like all the mojo/sls

  12. #12
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    The trouble here is I can't even find the price of the kit from the local distributor. If I had the measurements I could draw it cut and have the job done quicker than the time it would take to go to the lbs and the time he would have to spend on hold to the local distributor while they found the right person to talk to and then they would probably have to have it sent from the USA and I would end up paying anywhere between 2 and 4 times what it costs in the States and waiting god knows how long. I have been waiting for more than 3 months for springs for eggbeaters from a different distributor. I contacted Crank Brothers but they told my to go through local channels. So now I'm trialing both look and time pedals.

  13. #13
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    Where are you, Tatooine?


    I'll post some dims and pics from one next week. Sm or LG will be easiest because they're not installed, and ID and OD won't vary.

    A post above made me wonder.... Can you use the "inner wall of the can DIY shim technique" on a shock with the standard volume air can? There's not enough room in there, is there?

  14. #14
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    I live in Canberra.
    We had the Worlds here a while ago. Great place to ride but it is a pretty small city only about 350K people.

    The dimensions on the large will be all that I need, thanks. As I probably shouldn't make anything larger than that to be safe.

    I don't think there is enough room to reduce the volume via the DIY technique.

  15. #15
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    I;ve installed the medium Fox reducer onto my Mojo SL's RP23, but unfortunately I've not tested it out yet as I've had a chest infection for the past 3-4 weeks. Hoping to get out this week and tinker with air pressures. Hoping to be able to drop the air pressure to get more initial small bump sensitivity and then not bottom the shock out on 2-3 foot drops

  16. #16
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    Quote Originally Posted by dreednya View Post
    I;ve installed the medium Fox reducer onto my Mojo SL's RP23, but unfortunately I've not tested it out yet as I've had a chest infection for the past 3-4 weeks. Hoping to get out this week and tinker with air pressures. Hoping to be able to drop the air pressure to get more initial small bump sensitivity and then not bottom the shock out on 2-3 foot drops
    I think you'll get what you're looking for. I went from 165 psi w/ 20% sag and midstroke wallow, to 145 psi w/ 30% sag and a much nicer progression through the stroke.

  17. #17
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    Sounds good doismellbacon. Looking forward to first ride with the setup tonight . Going to take my shock pump in case I need to tinker

  18. #18
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    Here is the Official Fox Shock How To.

    Changing FLOAT Air Spring Compression

  19. #19
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    Sorry for the slow follow-up....super busy week.
    The Fox large volume reducer is:

    14mm ID
    38mm OD
    the slot that allows for installation is 9mm, maybe a bit more
    17.5mm height
    5mm wall thickness
    6.5mm base thickness
    2mm thick lip that's about 2mm tall

    The smallest spacer is a simple disk shape, with a hole and a slot:
    14mm ID
    38mm OD
    9-10mm slot
    6mm thick

    The medium spacer is currently in use, but you can use your imagination.. it's a shorter version of the large one.
    Attached Thumbnails Attached Thumbnails Anyone install Fox RP23 Shim/Volume Spacer on Mojo?-fox-rp23-lg-volume-shim-dims.jpg  


  20. #20
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    Given this thread, and Yody's report on a similar mod, and feeling like I'm also going through my travel on smaller hits than I'd expect, I'd like to give this a try too.

    1) Anyone know where to order this part? Google doesn't deliver for the part number and I don't see it on the fox online store.

    2) Given that so many have commented on this as a great mod for the HD, I'm curious why Ibis doesn't spec it as standard equipment? The HD was designed before these higher-volume RP-23's hit the market, right?

    3) Are there any benefits to using the larger volume shock unmodified? Does it work better for some rider sizes or riding styles?

    Thanks.

  21. #21
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    Quote Originally Posted by mikemikemike View Post
    Given this thread, and Yody's report on a similar mod, and feeling like I'm also going through my travel on smaller hits than I'd expect, I'd like to give this a try too.

    1) Anyone know where to order this part? Google doesn't deliver for the part number and I don't see it on the fox online store.

    2) Given that so many have commented on this as a great mod for the HD, I'm curious why Ibis doesn't spec it as standard equipment? The HD was designed before these higher-volume RP-23's hit the market, right?

    3) Are there any benefits to using the larger volume shock unmodified? Does it work better for some rider sizes or riding styles?

    Thanks.
    all very good questions I too would like to know as I haven't been able to order the part either to try it out...

  22. #22
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    I ordered mine from my LBS. They were not yet aware of it but were able to contact Fox or QBP or somebody and get it quickly.... the interweb is no substitute for a local bike shop with good ole fashion service. (props to The Bicycle Sport Shop in Austin)

    I'm sure that Ibis, and other mfr's, tune their suspension for the ride characteristics that they like and that they think will appeal to the broadest number of riders. But the ideal tune for you is dependent upon your weight, riding style, bike setup, preferences for feel, and the trail you're riding. Most DH pros will change their setup for individual tracks even though all those other variables are constant. That's why custom tuning can be so beneficial for many people, then it's dialed for you, rather than a compromise for the average middle of the bell curve theoretical rider....and why it's really cool that Fox offers these options and other DIY alternatives have been shared.
    All else equal, a larger volume shock will give you a flatter (less progressive) spring curve, so for instance, a really light weight rider who wants a plush ride w/ full travel, and who isn't hitting a lot of jumps and drops, may find a higher volume setup better. Likewise, a heavy aggressive jumper will need more midstroke and bottom out support which can be achieved by lowering the volume and creating a more progressive spring curve.... and of course there are infinite shades of grey in between.

    I think the Mojo / Mojo SL really benefits from lower volume and a more progressive spring....but of course that's filtered through all my preferences, weight, etc etc. Apparently the spring curve on the HD is quite a bit different from the SL, so it will excel with a different shock setup. At least, that's what I'm reading from HD owners here, and being told by the guys at Push...but I can't comment from my own experience....not yet anyway...

  23. #23
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    You can order it from fox by phone
    _______________
    1x10 IS SO FINE on my 21.9 lbs IBIS SL-R
    11-36 XTR in the rear, 36T wide-narrow upfront

  24. #24
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    homemade spacer

    Thanks again for the diagram. I made a spacer out of some 12mm thick HDPE chopping board.
    Attached Thumbnails Attached Thumbnails Anyone install Fox RP23 Shim/Volume Spacer on Mojo?-air-spacer-small.jpg  


  25. #25
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    Well I installed the large spacer and I'm much happier with the RP23. I weigh 235lbs with gear and now I can run much lower pressures and the rear feels better.

  26. #26
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    Call Fox tech Support

    Fox Float Volume Spacer kit ($24.99 USD, Fox part #803-00-612)


    Quote Originally Posted by mikemikemike View Post
    Given this thread, and Yody's report on a similar mod, and feeling like I'm also going through my travel on smaller hits than I'd expect, I'd like to give this a try too.

    1) Anyone know where to order this part? Google doesn't deliver for the part number and I don't see it on the fox online store.

    2) Given that so many have commented on this as a great mod for the HD, I'm curious why Ibis doesn't spec it as standard equipment? The HD was designed before these higher-volume RP-23's hit the market, right?

    3) Are there any benefits to using the larger volume shock unmodified? Does it work better for some rider sizes or riding styles?

    Thanks.

  27. #27
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    no luck from fox

    I've called twice to the number on the fox website and left messages, and sent an email, and no response over the past couple weeks. Anyone have a clue as to how to get through to them?
    Thanks.

  28. #28
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    1.800.369.7469

    ext. 4801

    Is what worked for me, I waited for someone to answer.

  29. #29
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    thanks, fox actually just called me back this morning, and the part is ordered...

  30. #30
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    My volume spacer just arrived but I'm having real difficulty getting the shock apart.
    Curious to what trick you guys have been using for the HV boost valve version of the shock.
    The large outer sleeve spins freely and trying turn just the small exposed portion near the rear of the shock isnt getting my anywhere.

    Really hoping I don't need to search out someone with a vise..

    Thanks
    Attached Thumbnails Attached Thumbnails Anyone install Fox RP23 Shim/Volume Spacer on Mojo?-photo-34-.jpg  


  31. #31
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    Grab the top portion and make sure all the air is out then twist counter clockwise.

  32. #32
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    Quote Originally Posted by theFuzz View Post
    My volume spacer just arrived but I'm having real difficulty getting the shock apart.
    Curious to what trick you guys have been using for the HV boost valve version of the shock.
    The large outer sleeve spins freely and trying turn just the small exposed portion near the rear of the shock isnt getting my anywhere.

    Really hoping I don't need to search out someone with a vise..

    Thanks
    First make sure all air is completely let out. You should be able to loosen by hand, since it should only have been hand tightend to begain with. If you still cant get it off, I seen a fox made video where they used a strap wrench. I would be very careful not to crush the air can if you have to use a strap wrench. I've taken apart tons of shocks and they always came undone by hand. Some times the air can is hard to re-install because the shock wants to rebound when your trying to thread the air can back on. It helps to turn rebound all the way clockwise/slowest rebound so your not fighting the shock on the air can re-install.

    Heres a video I found on youtube,

    <iframe width="560" height="315" src="http://www.youtube.com/embed/T1zD2PdZLyU?rel=0" frameborder="0" allowfullscreen></iframe>
    Last edited by fuenstock; 07-28-2012 at 07:03 PM.

  33. #33
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    maybe the negative air pressure is preventing you from pulling it apart ?
    something to watch out the previous video didn't show....

    <iframe width="560" height="315" src="http://www.youtube.com/embed/vb8BNsFcINQ" frameborder="0" allowfullscreen></iframe>

  34. #34
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    First ride today on my HD 160 with the medium volume spacer in the rp23 kashima shock. Made a big diffrence in small bump performace. I was still bottoming in all the regular places, but now run 10 psi less which gives much better small bump performance. The medium shim seems perfect for my trails, I might think of going to largest shim if I was going to the bike park for more bottom out control. Heres my shock settings before and after shim. I had to reduce psi in my float fork to match the softer rear after the shim went in.

    Rider weight 190lbs ready to ride

    Pre shim
    rp23 180 psi
    32% sag
    5 clicks rebound from closed

    Fox float
    65psi
    zero compression damping
    10 clicks from closed rebound

    ----------------------------------------------
    rp23 with medium shim
    rp23 170 psi
    32% sag
    5 clicks from closed rebound

    Fox float
    60 psi
    zero compression damping
    10 clicks from closed rebound.

  35. #35
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    fuenstock,
    are you getting anywhere near full travel on the Float ?

    While I had no problem getting full travel on my 150mm revelation on my old Mojo, I can't get near that on my HD with a Float 36 160mm (kashima skg seals) and I'm down to about 55psi for 200lbs + gear. Even when I take it to the parks with occasional front landing I'm not 100%

    On the rear no problem getting full travel, and I have 195psi on the rp23 but I want to try spacer next as I'm reaching that a bit too easily. Interestingly I had to increase psi after I serviced the shock.

  36. #36
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    Quote Originally Posted by adumesny View Post
    fuenstock,
    are you getting anywhere near full travel on the Float ?

    While I had no problem getting full travel on my 150mm revelation on my old Mojo, I can't get near that on my HD with a Float 36 160mm (kashima skg seals) and I'm down to about 55psi for 200lbs + gear. Even when I take it to the parks with occasional front landing I'm not 100%

    On the rear no problem getting full travel, and I have 195psi on the rp23 but I want to try spacer next as I'm reaching that a bit too easily. Interestingly I had to increase psi after I serviced the shock.
    Strange that you had to increase air psi after a service? Maybe you need more float fluid in it, that has the same effect as a voulme spacer when you increase the volume of the float fluid. More fluid equals lower psi, but more ramp up. Less fluid equals higher psi, but more linear feel.
    My float is also a kashima with the skg seals. I don't get maybe the last 3/4" of travel, but it's probably because I have not needed it yet. The fork feels good as is. I was getting less travel when I first got the fork new. I opened up to check oil volumes of lowers and the top of air spring. It's supposed to have 30ml in each lower and 5ml float fluid ontop the air spring. Mine had 20ml and 25ml in the lowers and 15ml float fluid on the air spring. 15ml on the air spring is 3 times what it was supposed to have! I reduced it down to 5ml and that made the fork feel more linear and use it's travel a little easier. It's worth a look and is a fast easy job.

  37. #37
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    it's the rp23 that needed more psi after I changed the seals. I expected the reverse (tighter new seals).

    Yeah, the float I already services the lower (no fluid and lots of dirt on 1 side (dooh!) and small sludge on the other side. 30ml now. I didn't check the air piston but yeah you're supposed to have enough just to lubricate and make a seal. Maybe I have a lot more than that. Will have to check next time (I need to replace 1 of the skg seal (air side) as I'm searing oil and getting dirt pile). Northstar is tough on gear.

  38. #38
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    Quote Originally Posted by adumesny View Post
    it's the rp23 that needed more psi after I changed the seals. I expected the reverse (tighter new seals).
    Sorry, Thats what I meant to say. The rp23 might need more float fluid. It's supposed to have around 2ml put into the can after the seals are lubed. I usually use the float pillow pack and heavly oil all the seals and pour whats left into the air can before I thread it on. Adding extra float fluid is like adding a volume spacer to the rp23, it lets you run lower psi and get the same sag as before. It's worth a quick look. Or I guess it could just be new seal stiction, but I never really noticed that.

  39. #39
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    The Fox tech utube video I saw only mentioned to put in a dime size amount of the supplied lube afterward - not entire thing or 2ml.

    I kept half for next time I will just clean and re-lube rather than full O-ring change.

  40. #40
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    Sorry to resurrect an old thread, but does anybody have a large spacer they don't want and would be willing to sell?

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    Quote Originally Posted by mountainbiker24 View Post
    Sorry to resurrect an old thread, but does anybody have a large spacer they don't want and would be willing to sell?
    I recently got the kit and only using the middle spacer (I may try the small one next) so I could sell the large one. ping me with your email address.

    I too recommend putting a spacer. I used to blow through travel too easily, and put the middle spacer during a trip to Whistler and ran 190psi (I'm 200+gear) with only full travel on bigger jumps. Back at home, I'm running 180psi (I was running 195 as still bottoming out on small jumps) and getting nice full travel while being plush.

    FYI, you should only put 2ml (or dim size) float lube in the shock, not the 5ml mentioned early by others. see my posted video link, or the fox link.
    Last edited by adumesny; 09-10-2012 at 09:29 AM.

  42. #42
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    Does this procedure reduce travel?

  43. #43
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    No. You only need to adjust sag/pressure afterwards.
    Correct number of bikes: n+1 bikes
    Correct body weight: m-10 pounds

  44. #44
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    New question here. Guidance on spacer size

    Hi Good People,

    I'm ~175-180lbs with full gear and I'm debating whether to start with the small or med spacer.

    Presuming I'd go with medium but I was wondering if there's a specific guide to follow for weight.

    Thanks!
    - -benja- -

  45. #45
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    Quote Originally Posted by benja55 View Post
    Hi Good People,

    I'm ~175-180lbs with full gear and I'm debating whether to start with the small or med spacer.

    Presuming I'd go with medium but I was wondering if there's a specific guide to follow for weight.

    Thanks!
    I weight 190 ready to ride and like the medium spacer for nomal all mountain rides and the large spacer for rides with bigger drops and jumps. The small spacer for me didn't do much. I ran around 30-33% sag no matter what spacer I was using. It's so easy to change the spacer that I would just take all three and swap them on your next ride for a good comparision.

  46. #46
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    Start with the big one and then try each one to see which feel you like best.

  47. #47
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    Just a heads up: you can buy the spacers from Jensen USA now$25

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    Does anyone have a medium they can measure the thickness of? I am going to machine a few sets up for the locals in Perth.

  50. #50
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    Quote Originally Posted by Magnum9 View Post
    Does anyone have a medium they can measure the thickness of? I am going to machine a few sets up for the locals in Perth.
    I posted a detailed diagram a little further up this thread with everything you need.

  51. #51
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    Quote Originally Posted by doismellbacon View Post
    I posted a detailed diagram a little further up this thread with everything you need.
    I know and its much appreciated , I was just hoping someone could give a definite thickness of the medium spacer otherwise I will just guestimate.

  52. #52
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    Oh crap... my apologies... I'd convinced myself that the medium was the one I'd measured, but it was the large. The medium is not a simple disc like the small one is, it's shaped like the large but just not as tall... If nobody beats me to it I'll pop my rp23 open later and measure it for you.

  53. #53
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    11/32 or 8.5mm tall

  54. #54
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    Yep, there you have it..... well, I was gonna call it 9mm. Anyway, I'm going to go ahead and post this since I went to the trouble of extraction and photographification....
    Attached Images Attached Images  

  55. #55
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    Nice

    I ended up using the large....I'm around 205 Riding weight. I found it really didnt effect my initial sag much but it feels firmer throughout it's travel. 200 PSI gives me around 30% sag.

    Still need to take it on a proper ride to see if I'm able to use all the travel and see how it feels on chatter.

  56. #56
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    Awesome, thanks guys I really appreciate it. Just have to machine some up and wait for my seal kit to arrive.

  57. #57
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    Figured it out, I have a CAD file if anyone needs it.

    Thanks

    I was hoping that I could get someone to measure up a large height for me I'm a bit bigger 220 on a rp23. Going to have one made up, my buddy has a 3D printer.

    Thanks for any help
    Last edited by kendal; 12-14-2012 at 09:24 AM. Reason: Figured it out
    2011 Yeti Big Top
    2012 Santa Cruz Tallboy
    1991 Cannondale m700

  58. #58
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    Double post
    Last edited by kendal; 12-13-2012 at 07:31 PM. Reason: Double post
    2011 Yeti Big Top
    2012 Santa Cruz Tallboy
    1991 Cannondale m700

  59. #59
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    Anyone know the measurements of the Mojo SLR shock? I have a new SLR with a Fox CTD. A buddy gave me his medium volume shim that I would like to try. I think I have a 7.875x2.25. According to foxes matrix, I shouldn't use anything but the small volume reducer. Thoughts?

    2012 FLOAT Air Spring Summary

  60. #60
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    I was under the impression that the SL-R's shock was 7.875x2 (same as HD140)

    I took a look at the Pinkbike article about these spacers and it looks like they're installing it above the metal washer...which is the same place I've installed my travel-limiting shims (for 650b clearance). Would installing them there physically limit the travel of the piston? I was expecting these volume reducers to clip onto the shaft on the other side of the metal washer...
    ride, eat, sleep, repeat

  61. #61
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    tdotrider is correct, the Mojo SL, SL-R, and HD-140 use 7.875x2.0 shocks. Don't put a 2.25" stroke shock on without limiting the travel.
    I haven't seen Fox's matrix but I would think it's just recommendations. I used the medium spacer in my RP23 when I reduced the travel for 650b on my Mojo SL....seems about ideal for my 170 lb, aggressive trail riding in rocky conditions. It's easy to experiment with, so go for it.
    TDO, the volume reducers snap onto the base, or head (not sure what else to call it) of the shaft up in the top of the shock....not on the shaft itself, so they will not change stroke length or interfere with travel reducer shims at all.

  62. #62
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    thanks for the input doismellbacon. after taking a closer look at the pic in comment #12 of http://forums.mtbr.com/650b/mojo-hd-...ld-815365.html, I can see the recessed space where the volume reducing spacers would actually sit without interfering with anything moving down the shaft.

    I'm about 200lbs ready to ride and can feel the rp23 blow through its travel on bigger hits, looking forward to seeing how it'd feel with a volume reducer.
    ride, eat, sleep, repeat

  63. #63
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    You guys are correct. I measure the Stancion and it came to 2.25 but when I let all the air out, it only goes down to 2 inches. I thought it was because of the volume shim, but I took that out and it went down to the same point.
    TDO, there is a space about the metal washer where the reducers sit. So after put the ruducer in, the metal washer still sits in the same place on the shaft as if there was no reducer in it.

  64. #64
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    Word
    Yeah, I was blowing thru mine at 170 lbs, med spacer did the trick.... You'll probably need to drop your air pressure ( and enjoy the fruits of better small bump absorption )
    I went from over 160 psi to 145 psi, with more sag, more cush, and better mid - deep stroke support.... Probably the best low effort big benefit upgrade I've done.

  65. #65
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    Quote Originally Posted by mcgong View Post
    Anyone know the measurements of the Mojo SLR shock? I have a new SLR with a Fox CTD. A buddy gave me his medium volume shim that I would like to try. I think I have a 7.875x2.25. According to foxes matrix, I shouldn't use anything but the small volume reducer. Thoughts?

    2012 FLOAT Air Spring Summary
    If you are interested I can sell you my small volume for cheap. I'm using medium on my HD (8.5x2.5) and sold the large which I should have probably kept...

  66. #66
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    Thanks for the offer. I put the medium in...hopefully I won't have a catastrophic failure like fox claims could happen. I really like the way the rear suspension feels now. More progressive, better small bump compliance.

  67. #67
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    hi, im broke due to my illness upgraditis lol! you think adding grease on the inside will do the same thing like the fox spacer?thank you!

  68. #68
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    Yes for about 20minutes of riding........Those spacers are only $20.

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