Originally Posted by
Steev
Is that right? Isn't it every tooth adds 1/2" to the chain length, 1/4" to top and bottom therefore 1/4" movement at the drop-out.
Nope. It adds 1/2" to the circumference of the cog, but the chain only covers about 1/2 of the cog circumference, so you divide again by 2, which gives you 1/8".
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