bought these wheels from the bike radar ads. comes with 8 sp cassette, but i got a 9 i want to use. but ive never seen this type of cassette before.
better pic can be found on the top row if you put 'sachs cassette' in google images.
is it a job for LBS? but more importantly, am i f*cked for using normal 9 speed cassette now? have i bought a pup? :-/

