The best informaton I found was to remove any rocks from the treads, place the tire on the balancer(that shows level)….Then place weight to balance. Mark on tire where to put weights(I use stick on 1/2 oz).. Then take tire off and verify balancer is in balance then put tire back on and verify the weights put back on same place balance tire. Do this a couple times to make sure… Thats the keyIMO.
I tested this tool out of the box. It was calibrated. Placed the tire on and the bubble was off center. I turned the tire and the bubble kept pointing to the light side. I marked that point. Lifted and turned the tire and placed it on again. The bubble pointed to the mark as it should. I balanced 4 tires. I was surprised the car was driving like silk. The steering wheel no longer shaking and the ride was smooth better than ever. 5 star. I balanced the wheels on another car. The unit paid for itself already. Note: There is no need to mod or modify this unit.
Larger truck rims have a big center hole on the rim, If your trying to balance larger truck tires with this balancer you will need a friend to help you place the wheel on the balancer as close to centered as possible and then adjust it more by having the friend help to center it as close as possible. If this is done properly and carefully so as not to damage the little balancer your truck tires will be balanced as close to perfect as possible considering this tools capabilities.. I've saved hundreds of dollars using mine as many a friends have used it as well..