On my commute this morning I established that my freehub needs replacing. There's obviously something wrong with the ratchet mechanism, because it intermittently refuses to engage.
My existing setup is a Mavic Crossmax rear wheel (circa 1998) which originally hosted a 9spd cassette. However I have been running it with a 4.5mm spacer and a 7spd cassette which has been working fine.
Can I replace the freehub with a 7spd one, or will that simply not work? Is the wheel somehow dished specifically for the 9spd width? Should I instead just buy another 9spd freehub and continue to use the 4.5mm spacer?
I did look on Sheldon's website, but couldn't find this exact scenario.