Originally Posted by
Morriep
What size cassettes do you use for touring? My Trek 520 is equipped with the standard 11-32 9 Speed. I am considering going 11-42 10 Speed. The front is 48/36/26. Any comments please?
10 tooth change?...thats a HUGE difference! As mentioned, can your drivetrain even handle it?
With 32mm tires-
- your current granny is 21.88 gear inches.
- your proposed granny is 16.74 gear inches.
If you just got a 24t inner chain ring, you would have 20.26 gear inches. Thats $20 and a 10min change.
If you got a 24t ring and a 34t cassette, you would have 19.18 gear inches. Thats $40 and a 20min change.
Just mention these options since they almost certainly wpuld work woth your current drivetrain and a 19.18GI is really low. You sure it wouldnt be low enough for you?