Originally Posted by
Jipe
But the Capreo, Moulton, Campagnolo N3W and I think this Sunrace use all the same idea: the part of the freewheel close to the spokes where the biggest cogs are located remain classic. But the extremity where the smallest cogs come has a smaller section to allow the 10 or 9 teeth cog. Campagnolo has an adapter that allow the use of the classic Campagnolo cassettes on the N3W freewheel.
Therefore my question if it is really impossible to mount a classic cassette on the Sunrace freewheel.
I have tested to put an old 9-speed cassette of the classic type on the Sunrace hub. Pictures at
https://www.flickr.com/photos/gunnst...h/50021529378/, scroll down.
The spline pattern is the same. The lower 6 cogs of the 9-speed cassette engage the splines. The rest have no support. But with a one-piece cassette, and a custom lockring, it might be possible to make it work.
The Sunrace lockring has threads on the inside, and the classic kind has them on the outside. The diameter is obviously very different. The Sunrace lockring requires a special tool - the Shimano Capreo tool works, which is why some suggest the Sunrace hub is a Capreo clone. I don't know.
https://duckduckgo.com/?t=ffab&q=shi...ages&ia=images
The custom lockring required to make this work should probably include a cylindrical part to stabilise the outer cassette, and on top of that, a threaded lockring which is wide enough to support an 11t outer cog. This likely means a different kind of tool interface is needed.