Does the replacement rear cassette have to have the same number of gears as the original cassette?
I have an 8 speed, and would like to get a different cassette range, but I don't know what would be compatable on my bike.
Originally Posted by CycleFreakLS
Yes, I concur. I run a standard 53-39 and a 12-25. I can climb the "hills" here in southern CA using the 21-23 and using the 25 as my bail-out gear on the steep climbs (20+ grade).
What cadence are you pedaling on those 20% grades?
Some people here say they can spin gears like that on high grades, at speeds that would equate to +1500 watts.