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TROUBLESHOOTING WHEEL AND TYRE 31-5 <WHEEL BALANCER CALIBRATION 1. Mount an undamaged original-equipment alloy rim and tyre assembly (wheel) onto your 2. <<Zero Calibration Check>> Loosen the balancer wing nut, rotate the wheel a half-turn (180 °), and retighten the nut. Recheck the balance. • If the imbalance is 5 g or less, the zero calibration is OK. Rebalance the wheel, then go to Step 4 to • If the imbalance is more than 5 g, go to Step 3. 3. Loosen the balancer wing nut, rotate the wheel 1/4 turn (90 °), and retighten the nut. Recheck the wheel balance. • If the imbalance is 5 g or less, the wheel may not be centred on the balancer, or the balancing • If the imbalance is more than 5 g, the balancer requires calibration. Contact the balancer manu- 4. <<Static Balance Check>> Attach a 5 g weight to the outer rim. Recheck the balancer. The balancer ± 2 g of imbalance 170 to 190° away from the 5 g weight. • If the imbalance is within specification, the static balance calibration is correct. Go to Step 5 to • If the imbalance is out of specification, the bal- ancer requires calibration. Contact the balancer 5. <<Dynamic Balance Check>> Attach a 5 g weight to the inner rim at 180 ° opposite the 5 g weight that was added in Step 4. Recheck the balance. ± 2 g of imbalance 170 to 190 ° away from both the inner and outer 5 g weights. • If the imbalance is within specification, the dynamic balance calibration is correct. The bal- • If the imbalance is out of specification, the bal- ancer requires calibration. Contact the balancer |