Originally Posted by acroy
I use a converted mountain bike with slicks for commuting, and would like a tighter gear ratio. Plus, not like I need that 32-tooth low...
I have a 9-spd Sram PG 970 cassette, can I replace straight-up with maybe a 105 cassette? Is the spacing the same? Chain width the same?
Thanks!!
Yep, no problem. You'll need to shorten the chain accordingly, but as long as you're going nine speed to nine speed the chain width will be the same, the shifters will work, etc.-
P.S. You will probably need to adjust the B screw on the RD also, because of the smaller large cog on the 105 cassette-