Join Date: May 2010
Location: Madison, Wisconsin
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It doesn't just depend on the teeth count difference, it also depends where your chain falls with each freewheel.
For example, I had a frame with short horizontal dropouts geared 42/15. Although the dropouts were long enough to accommodate a 6 tooth difference, there was no way I could run 42/15 and 42/16 on my flip flop because the chain would be too short in one or too long in another if I added a link.
Each tooth moves the axle 1/8". You can try measuring the hub in each position.