Excessive spacers on FMB, drive side RF Cinch 30?- Mtbr.com
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  1. #1
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    Excessive spacers on FMB, drive side RF Cinch 30?

    Wow, so put my next SL crankset on with a Boost RF 30t sprocket that I had and it seems like I have to use like 6 spacers to get my chainline, am I missing something? Crazy
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  2. #2
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    What do you mean by boost, and where are you putting the spacers?
    As far as I know RF doesn't make a boost-specific direct-mount ring. Their documentation indicates 51mm chainline (which matches Evil's recommendation) for the standard spindle in a 73mm BB with DM ring (not flipped). With a single drive-side spacer mine ends up super close to the chain stay. I haven't measured the chainline yet, but it seems closer than it should be.
    https://www.raceface.com/media/B30067-B-Web.pdf
    http://www.raceface.com/media/Crank_...chainlines.pdf

  3. #3
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    Well, apparently according to your docs we should put a 2.5mm spacer on the drive side. Its showing them on the bb. Ive been putting them past on the spindle and its way more than 2.5mm. Im gonna contact Evil tommorow to see whats up!
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  4. #4
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    If we get a reply from somebody with the exact set up and everything works great, that would be cool 😎
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  5. #5
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    I'm running one 2.5mm of spacer on the drive side with a 3mm offset Wolf Tooth chainring (as opposed to standard 6mm).

  6. #6
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    Thank you very much. Can I ask you, are your spacers on the actual BB cup, then threaded on or after the cup on the spindle? Thx in advance.
    Peace sells, but whos buying..

  7. #7
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    Maybe Im misunderstanding. Spacers go under the BB cup for threaded BBs (ie, between cup and frame). Typically on a 73mm BB, one 2.5 spacer under the drive side cup.
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  8. #8
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    Yes, thats what was confusing me. My Wheels mfg BSA 30 shows spacers on the outside of the cup. Then my bike shop says no spacers, just cinch it! No way on the FMB. Im going to do what bob-o did, exactly. Thanks for verifying!
    Peace sells, but whos buying..

  9. #9
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    So Wheels Manufacturing BB, the spacer goes on the spindle, not the bb cup.
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  10. #10
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    Ran into same issue when building a buddies bike using XT BB. Needed two spacers to get proper clearance between chainring and stay.
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  11. #11
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    Yeah, funny thing is I measured up the 5 spacers and it was only 3mm. Recommended is 2.5mm drivers side only. I also had to dremel the chain guide.
    Peace sells, but whos buying..

  12. #12
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    So I just had another look at mine... Based on the gap between the preload adjuster and the NDS crankarm, I've got very little opportunity to install additional spacers. Maybe 1mm? Feeler gauge says I have .33mm clearance between the ring and the stay, so even a half mm spacer would be a significant bump in clearance!

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