Sorry if this is in part slightly post-retro. Also, it's oft discussed but I seem to have got a bit lost in the details!
Just bought a '98/'99 RSP 250 (see viewtopic.php?f=4&t=243797
), with which I am very happy - lovely frame. It rides very well as it is, but been down-spec'd - in particular from 27 to 21 speed. The shifters are nasty combo modern 3x7s - which have to GO. Now I don't mind 7 rear, but all my other wheels etc are 9 and I prefer interchangeabilty. I could just fit friction shifters, but I happen to have some index 9 speed to hand and a set of new red DX V levers, which would be good with the red decals!
I could junk the wheels, BUT the as new Mavic M231 rims seem to be worth keeping. The hubs are also nice nick polished DX - and thus (I assume?) do not take a 9 speed cassette.
Seems to me three options. Rebuild the rear on to a new 9 speed hub. Replace the DX freehub with a 9 speed (I THINK that this is possible - with a re-dish/re-space?). Remove one cog from a 9 speed cassette to fit on the existing freehub, setting stops accordingly and altering when I swop wheels. For the cassette chop I imagine easiest is to ditch the largest?
What have I missed? All comments (up to and including derision) gratefully received!