Gear Tooth Bicycle Gear Ratios Chart

Colors group similar values.

Gear tooth bicycle gear ratios chart. A larger number indicates a large gear that is harder to turn over and is used for higher speed. Say the chainrings on the bike are 48 38 28 and the cassette is a 9 speed one. Drive ratios of bicycle hub gears what s new. As mentioned previously gear ratios are determined at the crankset and the cassette.

As a rule of thumb to keep the gear ratio similar when changing from 27 5 to 29 wheels you would have to go two teeth smaller on the chainring. Imagine riding on a flat approaching a hill. Note that neither of these are equal to the gear ratio for the entire train 4 3. Tom kunicki has a calculator with specific features useful for fixed gear and singlespeed riders.

Divide the number of teeth on each driven gear by the number of teeth on the drive gear for each interlocking set of gears to calculate the intermediate gear ratios. Gear inches wheel diameter in inches number of teeth in front chainring number of teeth in rear sprocket. Sheldon brown on facebook. Site feedback questions.

Gear ratio s in the bike gear ratio chart are determined by dividing the number of teeth on the front chainring by the number of teeth on the rear cog. In our example the intermediate gear ratios are 20 7 2 9 and 30 20 1 5. Moving your mouse over the ratio will show speed you will achieve by pedaling at 100 rpm. Rabbit a singlespeed and fixed gear calculator john allen has pages giving exact fractional ratios calculated from gear tooth counts.

Cassettes marked with an are made using either a oneup 16 40 or 16 42 or wolf tooth 40 or 42 tooth conversion. The distance covered in the lowest gear with a 34t chainring and a sram eagle drivetrain on a 29er is about 1 57 m per crank rotation and on a 27 5 bike with a 36t chainring one crank. Hover over the cells to highlight and see the gearing information. Essentially the lower the number of teeth on the chainrings results in an easier gear and the lower the number of teeth on the cassette creates more resistance harder gear.

It can in fact be said that front chainrings provide a wider gear ratio range while rear sprockets provide differences in gear ratios of adjacent gears. Cranksets set the tone for bike gear ratios on your bicycle. The 16 options give you a much more even progression through the gears. 3 is green 2 3 blue and below 2 red.

Ratio of the lowest gear of your setup. Complete bicycle gear ratio chart here is a complete bicycle gear ratio chart of the most commonly used bicycle chainring and cog sizes.