Front Sprocket for KTM SMC 690

Front Sprocket for KTM SMC 690 mounts on the gearbox output shaft to drive the chain and transfer power to the rear wheel. The chain and sprocket configuration on KTM SMC 690 may have been changed for a specific use.

What is Chromoly 440 steel used for?

The front sprocket uses CNC-machined, heat-treated Chromoly 440 steel. The front sprocket teeth remain in repeated contact with the chain while riding. Steel is used here to prioritize load and wear resistance. If the old teeth are pointed or unevenly worn, fit a front sprocket with the same tooth count to retain familiar riding characteristics. Also inspect chain and rear sprocket wear so all three components work together consistently.

Selecting tooth count for your riding needs

If you are happy with how the bike rides and are replacing only a worn front sprocket, retain its tooth count to preserve the gearing. To change the bike's response, a larger front sprocket reduces the final drive ratio when the rear sprocket remains unchanged. This model is available with 16 teeth.

Checks before installation

Count the teeth on the front sprocket currently fitted and photograph the chain markings to avoid ordering against an assumed stock setup. Check whether the front sprocket is retained by a nut or circlip and compare its shaft seating face before considering decorative hole patterns.