Bmx Bike Good Gear Ratio

Unfortunately due to hub and brake mount limitations not every bmx bike can accept every size option. The standard for bmx bikes for many years was 44 16. Classic bmx gearing evolved over the years to be 44 16 which has approximately 55 gear inches.

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Dirt jump bmx bikes are designed to handle and size or frequency of jumps on a dirt track.

Bmx bike good gear ratio. The most popular gear ratios are pretty close to a 55 inch which just seems to feel best for most people. This means that the front sprocket is 2 75 times larger than the rear sprocket or that the rear wheel will make 2 75 rotation for every full rotation of the cranks. A typical gear ratio for a 20 bmx bike is 2 75 1. Bmx gear charts.

Mathematically 16 times 2 75 is 44 and 44 divided by 2 75 is 16. I run about a 54 to 57 inch gear on my cruiser 17 in back and 40 in front usually with 180mm cranks depending on the track but i run 17 40 most everywhere. I ll be building up a 24 gt and i am going to use a 175 crank with a 46t sprocket on a 16t freewheel. 44 16 2 75 x 19 5 53 625 gear inches 20x1 75 tire.

For exact gear measurement. In the charts below i ve bolded the most common combo s. Classic bmx gearing evolved over the years to be 44 16 which has 55 gear inches. The other 10 is just keeping your place which is a lot.

The most popular gear ratios are pretty close to a 55 inch which just seems to feel best for most people. Modern common bmx gear combinations resulting in a ratio that will deliver a similar distance traveled with every pedal revolution are 42 15 39 14 36 13 25 9 and 22 8. Most pro bmxers run approximately 54 gear inches. 44 16 gear ratio with 20x1 75 tire is the most commonly used combination in bmx.

On a 20 bike i run a 45 16 gear setup which is similar to my 24 er. If you drop down it will be easier or less travel per crank. The average gear ratio is 44 16 on a 20 or 14 39 traveled per crank if you add a tooth in the front it will feel a tad harder but you travel a tad more also. Divide front gear by rear gear and multiply by tire diameter.

90 of any race is a sprint to and through the first turn. The gear ratio is different on these bikes as well making them easier to pedal from a complete stop with more emphasis on short bursts of speed rather than long sustained speeds during a race. I think that ratio is better suited for a 20 but i ll be strictly riding flatland with this bike. You can t do that with a gear ratio that is too hard to push out of the gate.