Originally Posted by
rhenning
The wheels are smaller in 650c so you need to gear a bike higher to get the same speed. I have a Bike Friday and to get the same gear range as my 1974 Paramount I need to use a 46-60 on the front and a 11-28 in the rear. Roger
Right, but the bikes Robbie mentioned both have the same wheel size, 650c.
650c seems small when you do a side-by-side comparison to 700c, but the difference seems negligible when you add a Bike Friday or a Moulton or Brompton (or any number of others) to the comparison.