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  1. #1
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    Reducing a Pike 150>140 and a 160>150 tech thread

    Figured this would be a good tech thread especially since the "Brolo" is becoming quite popular and reducing a 150mm pike to 140mm is what the "Brolo" guys normally run and perhaps the bronson guys who can't find a 150mm fork or want to be able to change it from 150>160 depending on riding trips etc.

    This is for my Bronson C XL frame I'm building.

    So, apparently competitive cyclist have me down for getting a 160mm pike rather than the 150mm that I ordered from them. It's not supposed to ship out till around the 12/13/13 so I have a few weeks to decide if I want to keep the 160 they are apparently sending me or swap it for the 150 that I had originally wanted. maybe the 150 was not available through them or something I'm not sure.

    It looks like you can reduce the pike 10mm the following ways

    Going from a 150mm > 140mm (brolo guys)
    RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 A1
    Bikeman RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 A1

    Going from a 160mm > 150mm
    RockShox Pike Air Shaft Solo Air 160mm Travel 26 or 150mm Travell 27.5 A1
    Bikeman RockShox Pike Air Shaft Solo Air 160mm Travel 26 or 150mm Travell 27.5 A1

    Is this all that is necessary to reduce either of the forks. Are the any downsides to reducing the forks from the original 150mm or 160mm to 10mm below that?
    Anyone got a write up of them actually only changing out the airshaft alone with no other maintenance?

    Revelation's Manual, quite similar to the Pike.
    http://cdn.sram.com/cdn/farfuture/_j...ice_manual.pdf

  2. #2
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    Good call on the thread. I am planning to do the whole 'Brolo' set up with a Pike. I have my Solo C frame and my Pike RCT3 160mm fork. Still need to order the air shaft.

    I originally thought that the lowers would need to be removed in order to change the air shaft but it looks like (from the Revelation manual) that you can just remove the air shaft from the top of the upper tube which means no suspension oil is required. So the tools/bits required (as per the Revelation manual) would be:

    1. 11.4018.026.003 - air Shaft PiKE Solo air 150mm travel 26”

    2. 24 mm socket wrench to remove the air spring top cap
    (this is from the Revelation manual so the air spring top cap might be a different size on the Pike - I will confirm)

    3. a pick to remove the top cap o-ring(s)

    4. grease to re-grease the o-ring(s)

    5. large internal snap ring pliers for the snap ring at the bottom of the non-drive side upper tube

    6. isopropyl alcohol, rag around and long dowel for cleaning upper tube

    I will order the air shaft soon and I will document the process of changing it.

  3. #3
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    In case anyone is curious there's some really helpful info on the Pike in this thread...

    Pike 2014

  4. #4
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    FWIW I'm running the Pike 160 on my Bronson C and love it. I use every millimeter of travel and wouldn't even think about lowering it. They should come from Santa Cruz w this fork as far as Im concerned. I'd run it the way it comes first if I were you.

  5. #5
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    There's also one more option, although it's a bit more involved, and that's having the air shaft cut and re-threaded to whatever travel you want. You could do this at home with the proper tools, but most people should have it done at a machine shop. The Revelation is available in 10mm increments from 100 to 150mm and there's no reason the Pike can't do the same.

    This would be good for Solo riders that want to keep the factory geometry (which is brilliant BTW).

    To confirm, yes, a 24mm socket fits the top cap. But I wouldn't recommend trying to remove the air shaft from the top. You're better off removing the lowers since you should check that RS added the right amount of oil anyway. You can use any off the shelf 0W30 synthetic oil from your local auto parts store.
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  6. #6
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    Quote Originally Posted by killjoyken View Post
    ... I wouldn't recommend trying to remove the air shaft from the top. You're better off removing the lowers since you should check that RS added the right amount of oil anyway. You can use any off the shelf 0W30 synthetic oil from your local auto parts store.
    In which case I might as well order the following too:

    - 11.4015.354.050 - RockShox Pike Suspension oil, 0W-30, 1 Liter Bottle (Bikeman RockShox Pike Suspension Oil 0-W30 1 Liter Bottle)

    - 11.4315.004.020 - RockShox Rear Suspension Damping Fluid 3wt 16oz bottle (Bikeman SRAM PitStop Rear Suspension Oil: 3 Weight; 16oz)

    - Bikeman Buzzy's Slick Honey (Bikeman: Grease)

    I have listed Bikeman because seems to be the only on-line dealer that has the Pike 26" 150mm Air Shaft in stock (Bikeman RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 A1)

    Just placed my order so will hopefully be doing the conversion soon.

  7. #7
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    I ordered mine from bikeman and did the conversion.It was easy and I have never serviced a fork before.

  8. #8
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    What steps did you take to do the conversion? Did you basically just follow the air spring service from the Revelation manual? And did you remove the lower legs to do it?

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    Bob- I did not read the service manual for the rev. that would have been a good source of info but I didn't see it. All i did was remove the lowers,remove the snap ring keeping the airspring in and pull the airspring assembly out and then pull those bushings or whatever they are off and put them on the new airspring grease and re-install everything.The hardest part was getting the snap ring back on.I did re-install the lowers back on backwards and had to take them off and re-install them.There is a blow up of the fork on the RS service page.It is called the spare parts list.

  10. #10
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    Can this be done the other way too?
    150 to 160

  11. #11
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    Quote Originally Posted by Kell12 View Post
    Bob- I did not read the service manual for the rev. that would have been a good source of info but I didn't see it. All i did was remove the lowers,remove the snap ring keeping the airspring in and pull the airspring assembly out and then pull those bushings or whatever they are off and put them on the new airspring grease and re-install everything.The hardest part was getting the snap ring back on.I did re-install the lowers back on backwards and had to take them off and re-install them.There is a blow up of the fork on the RS service page.It is called the spare parts list.
    Thanks so it really is that straight forward. Sounds like one of thos tasks that are just feel more intimidating than they really are.

  12. #12
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    Pike RCT3 service manual has just been published... http://cdn.sram.com/cdn/farfuture/si...e_manual_0.pdf

  13. #13
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    Awsome thanks,It looks like they now have an airspring for 130mm of travel for 650b.
    I will try one of those also

  14. #14
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    Quote Originally Posted by idsmokeu2 View Post
    Going from a 150mm > 140mm (brolo guys)
    RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 A1
    Bikeman RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 A1
    Can anyone who has reduced a 150mm Pike 27.5 down to 140mm confirm that this results in a 10mm lower axle to crown height? I don't see any point in reducing travel unless it also comes with reduced ride height.

    The reason I ask is that I was told by a very well-informed mechanic that while the travel is reduced (150 to 140mm) by changing the air shaft, the ride height remains unchanged..

    Anyone done the change and can confirm or refute this?

  15. #15
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    Quote Originally Posted by marcus_dukakis View Post

    The reason I ask is that I was told by a very well-informed mechanic that while the travel is reduced (150 to 140mm) by changing the air shaft, the ride height remains unchanged..

    Anyone done the change and can confirm or refute this?
    You need a new mechanic since yours is not very well informed. Reducing the travel will also reduce the overall height by the same amount. Check out the "Solo picture thread". There are a few guys that have reduced the travel on the Pike.
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  16. #16
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    Quote Originally Posted by marcus_dukakis View Post
    Can anyone who has reduced a 150mm Pike 27.5 down to 140mm confirm that this results in a 10mm lower axle to crown height? I don't see any point in reducing travel unless it also comes with reduced ride height.

    The reason I ask is that I was told by a very well-informed mechanic that while the travel is reduced (150 to 140mm) by changing the air shaft, the ride height remains unchanged..

    Anyone done the change and can confirm or refute this?
    quickneonrt on the Solo with beefy fork. thread confirmed an A-C of 530mm on a 150mm 27.5 Pike lowered to 140mm. The A-C spec for the 150mm 27.5 Pike is 542mm.

    Also worth noting that in the RS parts list there is only one size replacement upper assembly for each wheel size (in either black and white) and there is only one size replacement lower leg assembly for each wheel size (in each colour; black diffusion black and white). Meaning the A-C height differences between travel lengths can't be a result of the uppers or lowers because they're the same across the board. I assume by this that the differences in A-C heights therfore come from the internals i.e. the air shaft.

  17. #17
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    a-c measurement on my pike after changing the airshaft is 533mm
    the fox it replaced is 523mm @130 mm travel

  18. #18
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    And if you are curious about what changing the stock Float 32 CTD to a Pike RCT3 27.5 would do to the head angle on a Santa Cruz Solo C, have a look at the following:

    Fork Lengths, by Damon Rinard. Carbon forks and steering geometry changes.

    The formula is:

    arcsin [(old length - new length)/(wheel base)] = [change in head angle]°

    Which would be (for a Large Solo C):

    arcsin (523-533)/1140.1mm = -0.50255692°

    (*using Arcsin(x) calculator | Inverse sine calculator)

    A negative number in the result means your head angle will decrease/slacken by the value. So pretty much 0.5° slacker HA.

  19. #19
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    For anyone who has already reduced the travel, why the need for the different length air piston? Why cant you just add spacers like other models? Kind of hard to tell form the manual (posted above) why this isn't possible.

    Thanks

  20. #20
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    What about effect to wheel base? You kick out the front it's getting longer.

  21. #21
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    Quote Originally Posted by dansMTB View Post
    For anyone who has already reduced the travel, why the need for the different length air piston? Why cant you just add spacers like other models? Kind of hard to tell form the manual (posted above) why this isn't possible.

    Thanks
    Cause they changed the way air equalize between the positive chamber to the negative. In the past there was a valve (i.e. in a Lyrik), and in other there was a small whole in the air piston that let air pass when the fork was fully extended.

    Now, they use an whole in the stanchion (dimple) which is stationary. So the position of the piston to the dimple is very important now. With spacers you would put the piston above the dimple in the fully extended state so it wouldn't equalize the chambers.

  22. #22
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    Thanks, Very interesting reply. How does the dimple work?

    Is it a recess in the wall, meaning the seal doesn't expand all the way out there, therefore allowing air to leak past?

    Or a dimple (soft protrusion outward) which deforms the seal on the piston to let the air pass?

    I hope its something more similar to the recess. In either case, do you think this will accelerate wear on the air piston seal?

  23. #23
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    Recess in the wall:
    http://cdn.mos.bikeradar.com/images/...w48-670-75.jpg

    Time will tell if it impacts on seal wear rate. It definitely does increase it, but the real question is how much.

  24. #24
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    Thanks!! Good Job keeping track of that.

    For others interested, more pics and info here:
    Gallery: Video: SRAM, RockShox back 650B wheel size Review - BikeRadar

  25. #25
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    Re: Reducing a Pike 150>140 and a 160>150 tech thread

    Quote Originally Posted by Kell12 View Post
    Awsome thanks,It looks like they now have an airspring for 130mm of travel for 650b.
    I will try one of those also
    Where did you see it?
    Is it somewhere in the manual?
    I would like to try a 130 on a 650b pike...


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  26. #26
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    page 13 of the service manual shows 130mm air shaft in table.It may not be out yet by RS.

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    I called rock shox today and they said air springs to make 650b or 26" 130mm and the 29er has a 120mm air spring available. I have not looked into it past that. This puts it just right for the Solo and even a trail riding Tallboy2? I am between these two bikes but am definitely interested in the increased stiffness and positive reviews of the pike.

  28. #28
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    ive had a couple of rides on the pike now,it is a good fork.

  29. #29
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    Quote Originally Posted by skey44 View Post
    I called rock shox today and they said air springs to make 650b or 26" 130mm and the 29er has a 120mm air spring available. I have not looked into it past that. This puts it just right for the Solo and even a trail riding Tallboy2? I am between these two bikes but am definitely interested in the increased stiffness and positive reviews of the pike.
    Any chance you got a part number? I had a look at the 2014 service manual and its not listed there. I want to order one for my Solo and having the correct part number is going to make it a lot easier.

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    I plan to look into it tomorrow. I am planning to order a Pike for my Solo build if I can find the 130mm spring.

  31. #31
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    I just converted my 150mm 27.5"Pike to 130mm by taking a 26" - 150mm air shaft and cutting it down 10mm on a lathe. In this case there was no need to cut more threads for the lower shaft bolt. There are enough threads for the bolt if you only take 10mm of the 26" - 150mm shaft. I guess could have also just cut down the original air shaft but I wanted to preserve it for later use.

    Reducing a Pike 150>140 and a 160>150 tech thread-beforeafter.jpgReducing a Pike 150>140 and a 160>150 tech thread-130mm.jpg

  32. #32
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    The new air shaft for my Pike has arrived. This is the RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 (part#:11.4018.026.003). I am going to use this to lower a 160mm 27.5 Pike to 140mm for my Solo C.

    Reducing a Pike 150>140 and a 160>150 tech thread-pike-air-shaft.jpg

    I also ordered the RockShox Pike Suspension Oil 0-W30 and the SRAM PitStop 3WT Rear Suspension Oil (Part#:11.4315.004.020 - I was originally confused by this because it's labeled as rear suspension oil but this is the part number listed for the Pike in the 2014 spare parts catalogue). I also ordered a 2oz tube of Buzzy's Slick Honey since it sounds like this is better suspension grease that the old Judy butter.

    Reducing a Pike 150>140 and a 160>150 tech thread-rockshox-oils.jpg

    As mentioned before I will document the air shaft change and will post it here when it's done. I probably won't get to it until after xmas though. Also, it's been snowing quite a bit here in Ontario so snowboarding will take precedence

  33. #33
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    The whole thing will take under 10 minutes. The trickiest thing was removing the C-clip. It helps if you push down against the seal to allow the c-clip to compress fully. There is a small ridge between the two ears of the c-clip that does not allow it to compress making it difficult to remove it.

    I do suggest replacing the crush washers on both sides and the crush washer retainer on the spring side. This will ensure a right seal at the lower shaft bolts.

  34. #34
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    Quote Originally Posted by SFBMRC View Post
    The whole thing will take under 10 minutes. The trickiest thing was removing the C-clip. It helps if you push down against the seal to allow the c-clip to compress fully. There is a small ridge between the two ears of the c-clip that does not allow it to compress making it difficult to remove it.
    That part is mentioned in the instructions iirc, it shows it been pressed down and moved so the ridge sits under the ears of the circlip.

  35. #35
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    I take a small piece of pvc about a 1/2 wide and use it to push up so i can grab the c clip with snap ring pliers. That keeps you from jamming your fingers into the bottom of the stanchion tube, which sucks when you do it a lot.

    I think the price on the air sping kits are rather high, and it would be cool if rock shox would just include 3 of them with a $1000 fork.

    On another note, do you notice that only the last few clicks of your damper actually have any effect on the fork?
    Quote Originally Posted by SFBMRC View Post
    The whole thing will take under 10 minutes. The trickiest thing was removing the C-clip. It helps if you push down against the seal to allow the c-clip to compress fully. There is a small ridge between the two ears of the c-clip that does not allow it to compress making it difficult to remove it.

    I do suggest replacing the crush washers on both sides and the crush washer retainer on the spring side. This will ensure a right seal at the lower shaft bolts.

  36. #36
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    Excellent thread, thanks for sharing the info. INcreasing my travel from 150/26" to 160/26", ordered the shaft from Bikeman, only one they had in stock at the moment. Will report back after the installation.
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  37. #37
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    Am I right, that if I replace the air shaft in my Pike 27.5/150mm with this air spring, then I would get a ~130mm fork? Kit no. 11.4018.026.003
    It changes travel on a 20" to 120mm and a 26" to 150mm

  38. #38
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    Reducing a Pike 150>140 and a 160>150 tech thread

    Quote Originally Posted by Esben View Post
    Am I right, that if I replace the air shaft in my Pike 27.5/150mm with this air spring, then I would get a ~130mm fork? Kit no. 11.4018.026.003
    It changes travel on a 20" to 120mm and a 26" to 150mm

    No. Rockshox currently does not make a part that will lower the 27.5 fork to 130mm. If you read above I posted info on how I took the air shaft you mentioned (29/120 - 26/150) and cut it down 10mm. This brings the 27.5 pike down to 130mm.



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  39. #39
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    Quote Originally Posted by regularbob View Post
    The new air shaft for my Pike has arrived. This is the RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 (part#:11.4018.026.003). I am going to use this to lower a 160mm 27.5 Pike to 140mm for my Solo C.

    Click image for larger version. 

Name:	Pike Air Shaft.jpg 
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ID:	855999

    I also ordered the RockShox Pike Suspension Oil 0-W30 and the SRAM PitStop 3WT Rear Suspension Oil (Part#:11.4315.004.020 - I was originally confused by this because it's labeled as rear suspension oil but this is the part number listed for the Pike in the 2014 spare parts catalogue). I also ordered a 2oz tube of Buzzy's Slick Honey since it sounds like this is better suspension grease that the old Judy butter.

    Click image for larger version. 

Name:	Rockshox Oils.jpg 
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ID:	855998

    As mentioned before I will document the air shaft change and will post it here when it's done. I probably won't get to it until after xmas though. Also, it's been snowing quite a bit here in Ontario so snowboarding will take precedence
    Bob, why did you choose to lower a 160mm Pike to 140mm rather than a 150mm Pike to a 140mm? Been trying to track the various conversions…musta missed something. Is it because you wanted the dual air?

  40. #40
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    Quote Originally Posted by MattMay View Post
    Bob, why did you choose to lower a 160mm Pike to 140mm rather than a 150mm Pike to a 140mm? Been trying to track the various conversions…musta missed something. Is it because you wanted the dual air?
    Maybe its just because the easiest fork he could get was a 160mm version. Its not brain surgery.

  41. #41
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    It's a Solo Air 160mm 27.5 Pike, so not dual position air. I ordered the Pike with my SC Solo C frame from my LBS. I assumed that they would have ordered the 150mm Pike so I was quite surprised when I saw they had ordered the 160mm. Still not sure why they ordered the 160mm, maybe they thought that I would change my mind.

    Anyway, it doesn't matter much since I'm changing the air shaft anyway. As far as I can tell the only difference between the 150mm and 160mm Solo Air Pike is the sticker that says 160mm Solo Air and the actual air shaft. The sag markings on the stanchions show both the 150mm and 160mm markings. Not that these sag markings will help much once I have changed the air shaft.

  42. #42
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    Got it, thanks!

  43. #43
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    Quote Originally Posted by idsmokeu2 View Post
    It looks like you can reduce the pike 10mm the following ways

    Going from a 150mm > 140mm (brolo guys)
    RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 A1
    Bikeman RockShox Pike Air Shaft Solo Air 150mm Travel 26/120mm Travel 29 A1
    All the world must be reducing their 27.5 Pike travel...cannot find this part anywhere Google reaches...backordered worldwide! (Wonder if RockShox will simply offer a 140mm for 27.5?)

    EDIT/UPDATE! Bikeman says this part is not expected to be back in stock until MARCH 17!
    Last edited by MattMay; 01-06-2014 at 12:47 PM. Reason: Update

  44. #44
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    I have a 150mm on my Carbine 29er that I'd love to increase to 160mm. Has anyone attempted that conversion?

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  45. #45
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    Quote Originally Posted by Scottandhisdog View Post
    I have a 150mm on my Carbine 29er that I'd love to increase to 160mm. Has anyone attempted that conversion?
    I would imagine it would the same as reducing the fork, i.e. replace the air shaft with the 160mm 29er air shaft. The stanchions should have sag markings for both 150mm and 160mm, meaning the CSU is designed to accommodate either. According to the Rockshox parts list (http://cdn.sram.com/cdn/farfuture/pG..._spc_rev_a.pdf) you need the following part:

    Part#:11.4018.026.002 - Air Shaft PiKE Solo air 160mm travel 29” (can be used to change travel to 160mm on 29”) a1

    Looks like it's out of stock at Bikeman Bikeman RockShox Pike Air Shaft Solo Air 160mm Travel 29 A1

    It's a pity it's a 29er Pike and not a 27.5 because otherwise I would offer you my 160mm air shaft. Mine is the 27.5 version so it would end up being 150mm for a 29er.

  46. #46
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    I have completed the task of reducing my Pike to 140mm. I posted fairly detailed steps/pictures on the procedure here....

    bob loblaw bike blog: Reducing the Rockshox Pike RCT3 Solo Air travel

  47. #47
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    Absolutely brilliant post. Thanks for taking the time.

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  48. #48
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    any ideas if you could go to 100mm with a 26" fork?

  49. #49
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    Quote Originally Posted by moreda_5 View Post
    any ideas if you could go to 100mm with a 26" fork?
    120mm is the shortest travel listed for the 26" Pike in the travel adjustment table on page 12 of the Pike service manual...

    http://cdn.sram.com/cdn/farfuture/si...e_manual_0.pdf

  50. #50
    SC Junkie
    Reputation: SATANRULES's Avatar
    Join Date
    Oct 2005
    Posts
    97
    Guy's I am fully aware that QBP, BTI and many others are saying there will be a long wait on the 26" 150 mm air piston. I called SRAM today and they have them. So if you really need or want one visit your local bike shop and have them order it for you.

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