I have a 7 speed Hyperglide with 30-26-23-20-17-15-13. I'd like to drop the 15, and 13, and put in a 21 and 18.
That would make it 30-26-23-21-20-18-17. How would I go about doing that? I found on nashbar this http://www.nashbar.com/profile.cfm?c...A%20Freewheels
It is a 7sp with 13-32, it comes with a 21 and 18 that I could use as donor gears to my cassette?
Harris Cyclery (Sheldon Brown) carries individual cogs as well as some custom cassettes. You could have pretty well any combination you want with the exception that your smallest cog should be one that has the integral spacer and the radial grooves that latch onto the grooves on the locknut. http://sheldonbrown.com/harris/k7.html
I read the harris cyclery page. I don't understand why so many gear combos have 11,12,13 for their high gears. I almost never usethe 13, 15 on mine. I don't go particularly slow, on flat ground my cruising speeds when alone are often in the 24-26 mph range. My sprockets are 52 and 42. My goal in this gear change is to make the gear ratios close to each other, and then use all 7 gears.
Tonight when riding on flat ground I was cruising 23.5 mph in the 52-20 gear.
Last edited by maddyfish; 08-01-07 at 08:58 PM.
Reason: added info