gear calculator?

monkey_man_1

hiya, just wondering if anyone knows to a gear calculator or if anyone can advise on how to work out what the gear ratios are between cogs? if you understand that? so i can see for example the difference between a 22t front and 11t rear and say a 32tf and 15t rear etc...

thanks!

cooldad

Divide the rear into the front and you will get a ratio. ie 22/11 is a 2 to 1 ratio. 32/15 is 2.13. to 1.

cooldad

I think Sheldon Brown has it in tabular form somewhere.

cooldad

But you wouldn't actually use 22/11 would you?

monkey_man_1

thanks for the reply, that seems to make sence should be able to work it out now lol no i wouldnt use a 22/11 that was just two cog sizes that quickly sprung to mind!

Anonymous

Not a calculator, but out of interest this review has charts of 3x9 ratios vs 2x10 (SRAM) for comparison, specifically to point out the design of the SRAM 2x10 supposedly giving less overlapping ratios.

http://bikestuffreviews.com/2011/02/23/ ... 10-review/

Stevo_666

For those too lazy to look up Sheldon Brown:
http://www.sheldonbrown.com/gears/

To get gear inches, divide rear into number of rear sprocket teeth into number of chainring teeth, then multiply by 27.

Harry182

This one's also quite good -

http://home.earthlink.net/~mike.sherman/shift.html