Gear Sets
How would you go about figuring out a gear ratio??
I mean, yes, if it were a circle, all i'd have to do is find the circumfrence of the back gear, (on a bike) and divide the bigger front gear's circumfrence by that. but the thing is, the number of teeth vary from one set to another, and i want to make sure i'm putting my money in a new set of gears with a good enough difference. Also, some gear sets have slightly elliptical gears to make pedaling easier, (mine are too, but very very slightly.)
i'll need to know how to figure in the number of teeth and the tooth size if possible. thanks!
Hi Adeel,
Don't get too involved, my friend. It's simplicity itself: no. of teeth on the chainwheel divided by no. of teeth on the sprocket times the diameter of the wheel in inches, and that's it.
For example, if you have a 48-tooth chainwheel, a 16-tooth cog and a 27" wheel, it's 48 divided by 16 times 27 = a gear of 81 inches.
Sure tables are handy, but why bother? It's a little more difficult if you have "hard" numbers like 17, but, never mind, that gives you something to think about on a long ride.
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