DRIVETRAIN DYNAMICS & RATIOS

Bicycle Gear Calculator

Explore gear ratios, development, and target speeds at 60, 90 & 120 RPM cadence. Compare multiple drivetrain setups side-by-side.

Side-by-Side Comparison Compare Setup A vs Setup B

SETUP A (PRIMARY)

Front Chainrings

Rear Cassette 3 to 12 speeds

Wheel & Tire Size

Circumference: 2105 mm

Drivetrain Analysis Summary

Visual spectrum of speeds achievable across cadences (60 – 120 RPM)

Setup A

Cadence: 60 RPM | 90 RPM | 120 RPM

Gear Ratio

Front teeth divided by rear teeth (e.g. 50 / 11 = 4.55). Each crank turn spins the rear wheel 4.55 times.

Meters of Development

Distance travelled forward per 1 complete pedal revolution: Gear Ratio × Wheel Circumference.

Gear Inches

Historical imperial metric equivalent to the driving diameter of a penny-farthing wheel: (Front/Rear) × Wheel Dia (in).

Cadence Speeds

60 RPM is typical steep hill climb or grinder; 90 RPM is standard cruising cadence; 120 RPM is high-velocity sprint or spinout.