Calcolatore Rapporto Marce Bicicletta
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Rapporto di Trasmissione
2.94
Gear Ratio vs Chainring Teeth (front)
Formula
How Bike Gear Ratios Work
Formula
Gear Ratio = Chainring Teeth / Cog Teeth
Development = Gear Ratio x Wheel Circumference
Development tells you how far the bike travels per pedal revolution. Higher gear ratios mean more distance per revolution but require more force.
Gear Inches
Gear inches is a traditional measure: Gear Inches = Gear Ratio x Wheel Diameter (inches).
Esempio Risolto
A road bike with a 50-tooth chainring, 17-tooth rear cog, and 700mm wheels.
- 01Gear ratio = 50 / 17 = 2.94
- 02Wheel circumference = 700 * 3.14159 = 2199 mm = 2.199 m
- 03Development = 2.94 * 2.199 = 6.47 m per pedal revolution
- 04At 90 RPM: 6.47 * 90 * 60 / 1000 = 34.93 km/h = 21.71 mph
Domande Frequenti
What gear ratio is best for climbing?
Lower ratios (below 1.5) are better for climbing. A 34/28 combination (ratio 1.21) is a common granny gear for steep hills.
What gear ratio is best for flat riding?
Ratios of 2.5-3.5 are typical for flat riding at moderate cadence. A 50/17 (2.94) is a common cruising gear for road bikes.
What does development mean?
Development is the distance your bike travels with one full pedal revolution. Higher development means more ground covered but more effort required.
Impara