Originally Posted by
maddog34
exactly why i asked the question... the only way i've heard to fit an 8/9/10 sp. onto a uni-capable 7 sp. FH is to file down the higher step on the splines( i always call the low "splines" grooves or valleys) and use a lockring that will reach the internal threads.
i did remove a snap ring from one a decade ago to allow fitting an 8sp. Cassette... the snap ring was the stop, and no higher stepped splines were noted on that old thing.
so even the backward-compatible DA 8sp. FH was sized for a 7sp. cassette.... noted.
the mystery continues....
and for the record, i always call the HG/UG compat. FH a Uni-HG.... guess i'm just quirky that way.
i keep a couple Uni-only hubs around, and i have had a few uni/hg's here too... not sure if one's still in the bins tho....... i may dig them out and do some measuring/comparing...
Not sure why you are mentioning 7 speed since as already pointed out, the OP is working with an 8 speed UG/HG freehub body.
But, since you mentioned 7 speed freehub and 8/9/10, see the attached, beginning on post #52 about being able to put a
certain 10 speed cassette on a 7sp body.
10-speeds on a 126mm hub SUCCESS - Page 3 - Bike Forums
In regards to your comment of the DA UG/HG backward compatible body, it is 8 speed length and similar to the what the OP has as far as cassette fitment. It would take 8/9/10 HG cassettes, or any UG sprockets (except for the DA outermost threaded sprockets that had the reduced diameter). The first 8 speed DA freehub was UG only, but with the smaller outermost threads, and the only 8 speed 'UG' freehub it appears.