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simple...

A 650c bike is basically geared 1-cog lower that a 700c bike with the same crank and cassette. If both have a 53/39, then a 650c bike would need an 11-23 to work about the same as a 700c bike with a 12-25. If you switch to a compact, you can't get nearly as much top gear.

If the tire circumference is 1952 instead of 2110, the you have a reduction in gearing of 7.5%, which is slightly less than the average 1-cog shift.

A 50/11 top gear is in between a 53/12 and 53/13 on at 700c bike. If that 50/11 was on a 700c bike if would be a bit more top gear than a 53/12.
 
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