• I've used multi speed hubs and conversion kits on all my singlespeed builds now. I like being able to get a perfect chainline without any hassle. I wouldn't worry about wheel strength. Downhill mtb's with geared hubs don't explode whenever they hit a bump :-)

    As you have the option on a Cross check, I'd have thought you would use a 135mm rear hub? Mtb hubs tend to have better seals on them.

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