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Old 03-09-06, 09:00 AM
  #10  
marmotte
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with a 28'' wheel racing bike and a frequence 60:

If you have 42 / 26 , it means 12.8 km/h
If you have 45 / 15 , it means 24.1 km/h
If you have 52 / 14 , it means 29.9 km/h



with a 26'' wheel Mountainbike and a frequence 60:

If you have 42 / 26 , it means 11.9 km/h
If you have 45 / 15 , it means 22.0 km/h
If you have 52 / 14 , it means 27.8 km/h


1 km/h = 0.55 mph


(I think I calculated right, but excuse any faults )
marmotte
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