This 10T hardened, custom sprocket is the standard size that comes with every shifter kit and works well at low and high ranges. Width and pitch fit a standard BMX bike chain. Made in the USA.
Remember our shaft gears are designed to work on a 5/8" jackshaft with a 3/16 key and will not install directly on the engine output shaft.
=> If you are really into off-road or have some seriously steep hills the 9T is for your shift kit.
=> If you want some more top speed or just cruise at a lower rpm for MPG on your shift kit bike try the 11 tooth sprocket.