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Escorted from the White House
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650c wheels are about 7.5% smaller than 700C, assuming similar tire sizes. So basically, they turn 53-39 cranks into the equivalent of 49-36 cranks.

In other words, you kinda have a compact already.

/ I assume both wheels are 650C? 'Cuz if only the front one is, then your gearing isn't affected, obviously.
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