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With a 15 front and a 46 back sprocket you have a ratio of 3.06 revs of the drive to 1 rev of the wheel.
With a 17 front and 46 back the ratio drops to 2.7 : 1
With 15 front and 42 back it goes to 2.8 : 1
So you can see where the most gain is, and also the least cost and work.
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