Originally Posted by
illwafer
you can save what feels like (to me) about 1lb with a good cassette. i have an xt m770 9 speed cassette on one of my bikes, and it feels so much lighter than your run of the mill 7speed cassette.
Older bikes tend to have the old style screw-on freewheels instead of cassette systems. Replacing them with equivalent but lighter non-cassette systems is a very expensive proposition as alloy freewheels now command such high prices out there. 200 bucks isn't uncommon these days.
It's not the best area to save weight anyway if you ar thinking of aluminum alloy cogs, as they wear out much faster that the standard steel cogs on freewheels.
Chombi