RIM DIAMETER

The 700c (622 mm / 29 inches) is the most common wheel size for road racing. The 650b (584 mm / 27.5 inches) wheel size is used in specific areas. Each wheel size offers unique advantages for different kinds of riding.

650B WHEEL SIZE

Field of application:

  • Ideal for adventures on unpaved roads (gravel)
  • Ideal for smaller bike frames with adapted geometries

ADVANTAGES

  • Ideal for wide, high-volume tires if there is enough space between wheel/fork and wheel/chain stay (large clearance).
  • Option of lower tire pressure, which results in greater traction when cornering, accelerating and braking, improved rolling resistance on rough roads and trails as well as greater comfort.
  • Also suitable for small bicycle frames where the frame dictates wheel size.

DISADVANTAGES

  • The combination of a small wheel size and a wide tire leads to reduced acceleration and reduced response.
  • Less rollover performance and rolling resistance with the same tire and tire pressure compared to 700c.
  • Limited choice of road tires due to the rather rare wheel size.

WHEEL SIZE 700C

Field of application:

  • Ideal for racing on asphalt roads
  • Ideal for competition racing on unpaved roads (gravel)

ADVANTAGES

  • Wide choice of tires as it is considered the standardized wheel diameter for asphalt roads.
  • Smoother ride due to the larger wheel diameter.
  • Reduced inertia when the wheel is in motion.

DISADVANTAGES

  • Slightly reduced acceleration due to inertia, compared to the same rim-build.
  • Slightly greater weight due to longer spokes and additional rim material.