|how to calculate gearing?||gsxrawd|
Jun 8, 2002 10:45 PM
|let's say i have a big ring at 53 and the small cog at 12, is it 53 divided by 12 times 27 (for 700c wheels)? what about if I have 650c wheels? do I times it by 26?|
Jun 9, 2002 4:43 AM
|Your forumula is correct (ring/cog x 27), but the gear- inch formula does not give a value that means anything. It's just a gear ratio times a constant.
If you want to compare a 650c wheel to a 700c, you need to know the diameter of each tire. Then take the ratio of the 650 tire diameter divided by the 700 tire diameter to get an equivalent gear-inch value.
For all practical purposes, a 650c bike would use a cassette with a one-tooth smaller top cog and a two-tooth smaller big cog to be geared close to the same (an 11-21 instead of a 12-23).
|Yup nm||the dad|
Jun 9, 2002 7:30 AM
|re: how to calculate gearing?||shortstroke|
Jun 11, 2002 8:09 PM
|Save you the trouble, try this link...