Originally Posted by
cycle_maven
Going to 7/8 speed cassette isn't a big deal- you can use your original crank, derailleurs, everything. There are some gotchas, though...
1) Your dropout spacing is probably 126 mm, and would need to be spread. Some people can muscle in a 130mm wheel and call it good. Best to cold-set it, though.
2) Is your current wheelset 27" or 700c? If you want to change from 27" to 700c, then the brakes may need to be replaced or modified (sometimes there's enough adjustment room to fit, and sometimes it's close enough that the slot in the brake arms can be filed a couple of mm to fit).
If you want to go to 9 or 10 speed, then in addition you'll need a new crank, probably new rear der, likely new front der, new shifters and cables. At that point it's probably not worth it- you can get a new bike for nearly the same price as the upgrade components.
Thanks for the replies. The wheels are 700c, so that's not a problem. A couple more questions: Will my existing shifters still work as indexed if I jump up to a 7 or 8 speed? Would a new crank for a 9/10 be necessary because of the tooth spacing? Could a new chain ring do the same thing?
Since I didn't pay much for the bike, I'm trying to do the math on upgrades that would cost less than a new bike of comparable quality. Plus I love the look of the frame. Thanks again.