Balancing Tires/Wheels

At the local tire shop getting some 40" tires mounted and balanced onto new Icon wheels. All but one tire/wheel balanced fine. On the last one, the machine said to place 18.5 ounces on one side and 20 ounces on the other (exact opposite) side of the wheel. The shop tech said this is excessive. The master tech came and said it's odd but to do it anyway.

My question is this: is it legit to cut the ounces by equal fraction to 9.25 and 10 ounces respectively? I'm not sure why the amount has to be so high if each side is balancing off the other. For that matter, is it possible merely to have 0 and 1.5 ounces respectively? I may take this particular wheel/tire combo to another shop for a second opinion. Anyone have experience here?

 

Have then rotate the tire to a different position on the rim and see what happens when they balance it.

 

There's usually a dot on the tire when new that shows the heaviest side. They are supposed to match that to the wheel to sync them up before adding weights. It reduces the amount of weight needed. That said, they're 40's. Gonna take some weight to get them balanced.

https://www.chapelhilltire.com/yell...to the yellow dot,is the most imbalanced part.

 

Good point.

 

Find a better shop.