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Gear Inches Chart
Compare every chainring and cog combination by gear inches, gain ratio, or speed.
Wheel / tire
700×23c
700×25c
700×28c
700×32c
650b 27.5×2.1
26" MTB
29er
Other (enter mm circumference)
Tire circumference (mm)
Chainring teeth (comma-separated)
Cassette cogs (comma-separated)
Cadence (rpm)
Crank length (mm)
Show
Gear inches
Gain ratio
Speed (mph)