Bike Speed Calculator

Your details

Choose whether to calculate speed or the cadence required to hit a target speed.
Pedal revolutions per minute. Recreational cyclists average 60-80 RPM; trained cyclists 80-100 RPM.
RPM
Number of teeth on your front chainring. Road bikes commonly use 50-53T; gravel/MTB 38-44T.
teeth
Number of teeth on the rear sprocket currently selected. Smaller cogs = higher speed for the same cadence.
teeth
ETRTO rim bead-seat diameter. 700c is the standard for road bikes; 29 in is the same rim diameter.
Tire section width. Wider tires increase wheel circumference and speed slightly for the same cadence.
Speed
33.53

Your cycling speed at the given cadence and gear combination

Speed (alternate units)20.83
Gear ratio2.94
Gear inches77.8in
Rollout (development)6.209m
Wheel circumference2,111mm
2.94 :1
Very easy<2Easy2-3Moderate3-4Hard4-5Very hard5+

At 90 RPM in a 50/17 gear you are travelling 33.5 km/h.

  • Your gear ratio is 2.94:1 - for every pedal revolution you drive the wheel 2.94 times.
  • Each crank revolution moves you 6.21 m, so at 90 RPM you cover 0.56 km per minute.
  • Your cadence sits in the sweet spot most coaches recommend for endurance and efficiency.

Next stepTo go faster: increase cadence, shift to a harder gear (bigger chainring / smaller cog), or do both. A power meter lets you balance all three variables precisely.

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