I have a brand new Titanium Boost 29er hardtail. The frame uses a PF30 BB and the BB shell is 73mm wide.

I have installed the recommended RaceFace cinch PF30 bottom bracket with a Race face Next SL crank - 175mm arms and 32t single chain-ring.

The problem is that the clearance between the chain stay and the crank arm is next to nothing. There is no contact yet but I am unable to run the recommended crank boot protector.

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The instruction for this BB so not to use any spacers since it 73mm (68mm ones use spacers).

Adding spacers wont help as it does not lengthen the spindle. I do not see how a Shimano XTR/XT crank will work here either since it has the same Q-factor.

Any other ideas?

1 Answer 1


RaceFace makes cinch spindles in various lengths. I assume you have a version for 68/73mm bottom brackets. There's also a 100mm bottom bracket spindle option. It will certainly fit, but Q-factor might become too wide for your liking. Theoretically, you can also order a custom length spindle and spacers from some CNC manufacturer.

  • Thanks pal, there is a pdf from Race face with the different spindle lengths. On there they note a RF143 seems to be the next one up after the 68/73mm one I have but looking on their website they only have 3 options. see link here: google.co.nz/…
    – TResponse
    Commented Apr 23, 2016 at 4:29
  • 1
    Wow, that's a lot of options. I'd email them and ask about everything directly. Commented Apr 23, 2016 at 4:34
  • Update on this: I emailed raceface and eventually got an answer back. They collaborated with the manufacturer of my frame and the guys are arranging a RF143 spindle for me which the correct one to use on my bike. Thanks for your interest and advice.
    – TResponse
    Commented Apr 27, 2016 at 1:25

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