t_s

I recently purchased a new set of wheels (Shimano C24 11 speed) and I am running a 9s drivetrain. My understanding from perusing the forum is that a 1.8mm spacer will be necessary when I install my 9s cassette on the new 11s hub. In contrast, installation of a 10s cassette on an 11s hub would require the 1.8mm spacer + a 1mm spacer. Understanding that the end goal is to allow the small cog hang slightly over the end of the hub so that the the lockring compresses the cassette without compressing the hub body, could someone confirm that this is the correct configuration for installing a 9s cassette on the 11s hub? Thanks in advance.

oldbobcat

You are absolutely correct. Well, my sources say that Shimano shim is 1.85 mm, but what's 0.05 mm between friends? I know one guy who uses two 1 mm shims instead of the 1.85, with no problem, except his bike won't shift well with anyone else's wheels. I'm letting him run with it until he comes in to pick up his 1.85, but this is a kludge I do not recommend.

Enjoy your C24s. I hear they're sublime.

t_s

Thank you! I'm just a little paranoid about getting it right with these wheels since they were not an insignificant investment. Appreciate the confirmation.

dsbrantjr

0.15mm (2.0-1.85) is less than 0.006"; two "identical" wheels are likely to vary more than that.,

oldbobcat

What I love about this forum.