Bmx Gear Ratio Explained

There are different rear sizes but the standard is 16 when talking about gear ratios even if you ride 9t or 14t rear you almost always know the conversion to 16t. The gear ratio is necessary for calculating the speed a given gear chain will produce. The most popular gear ratios are pretty close to a 55 inch which just seems to feel best for most people.

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Welcome to our site! Here we have a plenty of bmx gear ratio explained for you as your basic idea in your next action. Feel free to download the image and use it as your guideline. The free bmx gear ratio explained images provided below can help you experiment more

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Bmx gear ratio explained. This is the first draft of this. By rearranging the rider torque equations and substituting those into the wheel torque equations we can see the torque produced at the rear wheel is identical whether we are using a big gear setup or small gear setup so long as the gear ratios are truly equal. Gear inches are used to give a numerical value to how a particular chainwheel cog combination will feel. Classic bmx gearing evolved over the years to be 44 16 which has approximately 55 gear inches.

For example using a high gear ratio such as 53 x 12t is. Mathematically 16 times 2 75 is 44 and 44 divided by 2 75 is 16. Most pro bmxers run approximately 54 gear inches 44 16 gear ratio with 20x1 75 tire is the most commonly used combination in bmx for exact gear measurement. Hopefully this video goes someway towards explaining how we come up with those numbers.

The equation is speed gear 1 teeth gear 1 speed gear x teeth gear x. 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. The gearing on a race bmx is higher than on one you will buy out of the store. A typical gear ratio for a 20 bmx bike is 2 75 1.

The resulting value gear inches represents the diameter for an equivalent direct drive wheel like the front wheel of a penny farthing. Divide front gear by rear gear and multiply by tire diameter example. Ever wondered why we use numbers like 53 54 and 55 for bmx gearing. How to change your gear ratios duration.

Most bmx will come with 44 16 gear ratio where racers will use 46 48 16 and i have seen higher. The standard for bmx bikes for many years was 44 16. 44 16 2 75 x 19 5 53 625 gear inches 20x1 75 tire these charts are for general reference. When you have that information you have half of the information needed to calculate the speed.