Originally Posted by
Dave Mayer
Possible in theory...
I have done the Ergopower ratchet upgrade. Easy.
In contrast, I have a rear 8-speed Record-level wheel that I want to do the freehub upgrade on. I have been looking for 3 years for a suitable donor freehub.
And I volunteer at a bike Co-op, where I get to screen hundreds of pounds of donated bikes and parts per shift...
The freehub "stub" side of the rear axle is 12mm, with people reporting success transplanting cartridge bearing freehubs although I can't verify confirm that personally - I swapped mine around 2001 before the supply of NOS cup-and-cone 10mm axle 9 speed freehubs dried up.
@gfk_velo should be able to authoritatively confirm or deny compatibility.