Visual signs
Look for teeth that lean in the direction of travel, sharp or pointed tips, and wear that is worse on one side of the sprocket than the other.
Trail readiness / drivetrain reliability
Hooked teeth, sharp tips, uneven wear, chain lift, skipping, and new drivetrain noise are the clearest wear signals. When the chain does not seat cleanly, the sprocket is usually past the comfortable service window.
Look for teeth that lean in the direction of travel, sharp or pointed tips, and wear that is worse on one side of the sprocket than the other.
Skipping under load, chain lift, rough engagement, and new noise under throttle can all point to sprocket wear or poor fitment.
Light polish is not the same as wear. If the tooth shape has clearly changed, replacement is usually the safer call.
Contact the team if wear appears early, if a conversion keeps damaging parts, or if you need a replacement spec that matches the bike and riding load better.