Originally Posted by
louye2
The Shimano Hyperglide C cassette on my Trek 470 road bike is a bit worn. I would like to replace it, but I am not sure what tooth combination to choose. The original cassette is a 7 speed 11T - 24T. Between Nashbar, AEbike and other vendors, I have seen 12-32, 11-28, 13-26, 12-28, etc.
I do most of my riding on a paved 25 mile rail trail that is fairly flat with some small inclines. What cassette combination would you recommend for me?
Thank you.
13-19.
52x13 is a 45 MPH sprinting gear which is ample, and you don't want to waste your limited cog count on smaller cogs.
In the 8 speed era 13-21 was my favorite. For fairly flat I'd give up the 21 before the 18 which yields 13-19 seven cogs.