Chain, front sprocket, rear sprocket: when should you replace the lot?
The newsroomUpdated on October 3, 2026schedule6 minMeasure chain stretch, read sprocket tooth wear and fit a complete kit: a practical guide to looking after your motorcycle's final drive.
Key point
If the chain lifts clearly away from the back of the rear sprocket when you pull it by hand, wear is already well advanced.
A worn final drive gives no warning: it jumps a tooth as you power out of a corner, or it snaps. Here is how to check your chain kit for wear in ten minutes, and why the three parts are almost always replaced together.
1. Measure the stretch
A chain doesn't really "stretch": the pins and bushings wear, and every link picks up a little play. With the chain under tension, measure its length over the number of links specified by the manufacturer and compare it with the limit in your bike's manual.
2. Read the teeth
On the rear sprocket, hooked teeth mean the end of the road. The smaller front sprocket on the gearbox output wears even faster, because the load is spread over fewer teeth.
3. Replace the complete kit
Chain, front sprocket and rear sprocket wear together. Fitting a new chain on worn teeth throws away half of its service life. While you're at it, check the wheel bearings and the chain slider.
- Stick to the original tooth counts, or recalculate the chain length if you change the gearing.
- Fit the master link according to the manufacturer's instructions.
- Set the slack to the manufacturer's figure, then check it again after the first ride.
Gear mentioned
at our partner Karraz MotorsFrequently asked questions
Can I replace just the chain?add
Only if both sprockets are close to new. Otherwise the new chain will wear out prematurely.
O-ring or standard chain?add
Sealed chains (O-ring, X-ring) keep their grease in and last longer on the road; in motocross, a lighter standard chain is still common.
How often should I lube it?add
After every wash and every ride in rain or mud; otherwise at the interval given in the owner's manual.
Written by the Karrazmotorsport newsroom, proofread before publication. For settings, always refer to your vehicle's manual. Our charter.
