Replace a worn front sprocket or adjust the final drive with a version that fits the chain and output shaft exactly
The front sprocket is mounted on the output shaft of the gearbox and transmits the engine torque via the chain to the rear sprocket. Due to the relatively small diameter and limited number of teeth, a front sprocket is heavily loaded and precise fitting is essential.
In this collection, you will find SuperSprox front sprockets for various motorcycle brands and models. Always select a sprocket based on the exact part number and not solely on chain size or number of teeth.
The internal gearing, width, offset, and locking must fully match the output shaft and the existing chain line.
The chain size determines the width of the sprocket teeth. A front sprocket for a 520 chain cannot be correctly combined with a 525 or 530 chain.
For a conversion to a different chain size, the front sprocket, rear sprocket, and chain must be replaced as one complete configuration.
With the same number of teeth as the original, the factory ratio is maintained. This is usually the simplest choice for regular maintenance and when the original character of the motorcycle is preferred.
When replacing, also check the rear sprocket and chain. A new front sprocket on a heavily worn chain can quickly wear again.
A smaller front sprocket shortens the final drive. The engine then revs higher at the same speed and generally responds more directly during acceleration.
A larger front sprocket lengthens the ratio. This can reduce the engine speed at cruising speed but also decreases the mechanical multiplication of the engine torque.
A very small front sprocket causes the chain to bend more sharply around the sprocket, which can increase load and wear. Therefore, an adjusted ratio is often preferred to be achieved via the rear sprocket.
On motorcycles that measure the speed signal via the gearbox, a different final drive can affect the displayed speed and mileage.
On systems that measure speed directly at the wheel or via ABS sensors, this effect may not occur. Check the operation on your specific motorcycle.
Check the front sprocket nut, locking ring, locking plate, and spacers for damage. Use new locking parts when the manufacturer prescribes this.
Tighten the fastener with the correct torque and check chain alignment and chain slack. Always replace the front sprocket cover before using the motorcycle.
Shop detailing products for
your motorcycle
