BMX Sprocket FAQ's

What is the difference between Bolt Drive, Spline Drive, and Socket Drive Sprockets?

Bolt Drive sprockets are considered the standard in BMX. The sprocket is held in place using a single bolt that connects the sprocket and crank arm together. Bolt drive sprockets are easy to install and work on a wide variety of crank spindles.

Spline Drive sprockets were originally developed by Tree Bicycle Co. This style of sprocket uses a steel insert in the center bore that's keyed to fit 48-spline spindles only.

Socket Drive sprockets were originally devolved by Odyssey and have a 9-sided center bore that fits Socket Drive cranks only. Both systems eliminate the need for a sprocket bolt but must be matched exactly to your crank setup.

How do I know which chain wheels will work with my bike?

There are two things to consider when purchasing a new chain wheel. The width of the teeth on the chain wheel and the bore of the spindle hole determine compatibility. Chain wheels with 3/32" teeth will work with all size chains. Chain wheels with 1/8" teeth will only work with 1/8" and 3/16" chains. A chain wheel with a 15/16" bore will work with all cranks. All other bore sizes are limited in what cranks can be used. An adapter may be required to adapt a certain chain wheel to a certain crank.

What is meant by gear ratio?

Gear ratio is a relative term used to indicate how far the bike will travel forward (in inches) with on revolution of the cranks. It is determined by dividing the number of teeth on the front sprocket by the number of teeth on the rear sprocket and multiplying by the wheel diameter. It is possible to achieve the same gear ratio by using different gear combinations. For example, on a typical 20" bike, a 44 x 16T gear combination results in the same gear ratio as 33 x 12T gear combination. To see our gear chart Click Here.

How do I determine what gear ratio is best for me?

Like many aspects of bike set-up, the gear ratio is a matter of personal preference. Increasing the number of teeth on the front sprocket or decreasing the number of teeth on the rear sprocket will result in a higher gear ratio. This will make the bike hard to pedal on take off but will allow a higher overall speed. Decreasing the number of teeth on the front sprocket or increasing the number of teeth on the rear sprocket will result in a lower gear ratio. This will make the bike easier to pedal on take-off and result in a lower top speed. It is best to use your current gear combination as a starting point then determine what you are trying to achieve. To see our gear chart Click Here.