Yes, well, the person riding the bike is the biggest factor. However, you can put the same effort into two different bikes and get a completely different speed. The factors that make one bike faster than another with the same effort include:
  • weights of bike, components, and wheels (lighter=faster)
  • aerodynamic profile of bike and rider (less frontal area=faster)
  • inflation, width, and tread of tires (highly inflated, narrow, smooth=faster)