roller size
  1. L

    Friction drive: Tire diameter, does it matter?

    My brother has a 700C fixie and it's tire is much bigger than mine. Our motors are the same, both of us has the same expansion chamber exhaust, and both of us run stock carbs on stock jets, and he goes a full 4 mph faster than I can. I believe it's the bigger tire, at the same rpm his bike rolls...