Just had a set of Michelin PR3s put on my 2011 RT. They needed 75 grams of weight on the rear, and 65 grams on the front to balance. Seems like a lot. I don't see any yellow dots on the PR3 to show the light/heavy spot, but the weights are straight across from the valve stem (with TPMS).
How do I know if the tire is mounted in the right position, or doesn't it matter?
Is the valve stem/TPMS the cause?
FWIW, the original Bridgestone B021s needed a lot of weight, too, but I don't remember where on the rim.