My top speed while commuting is 35mph on a flat sprint.
Originally Posted by
ShartRate
At what speed do most road bikes spin out at in top gear? 26-30mph? Anything faster than that will just be gravity then, right?
Depends on the gearing.
http://sheldonbrown.com/gears/
My bike (700c road wheels, 170mm cranks) has a high gear of 50 tooth front (compact gearing) and 12 tooth back, at 120 pedal rpm (getting close to many people's "spin out") = 40.2mph.
And yes, once you get much beyond that point, you're better off in an aerodynamic tuck.
Bikes with more standard gearing (52 or 53 front) and assuming same size wheels/cranks with an 11 tooth in back will go 46.4 mph @ 120 rpm.