This evening, my brother and I were mounting some Blizzaks for my Expedition. He has a neat, high tech spin balancer (sorry, don't know the brand) which shows the amount of weight required on the inside and outside of the assembly, as well as the location, obviously.
For the heck of it, we threw a bare wheel (factory Ford aluminum 18" x 8.5") on the balancer, spun it, and saw that the wheel itself was out of balance by about 2 ounces; the machine was calling for 1.25 oz on the outside and 0.75 oz on the inside. The imbalance was in the area of the valve stem. The pressure sensors are located 180 degrees opposite the stem, so the imbalance would have been even greater if the sensor was mounted on the stem, as a lot are. I don't know if this is an earth-shattering revelation, but I sure found it interesting.
BTW - The final balance called for about 0.75 oz of weight inside and outside at roughly the same place as the original imbalance spot.
For the heck of it, we threw a bare wheel (factory Ford aluminum 18" x 8.5") on the balancer, spun it, and saw that the wheel itself was out of balance by about 2 ounces; the machine was calling for 1.25 oz on the outside and 0.75 oz on the inside. The imbalance was in the area of the valve stem. The pressure sensors are located 180 degrees opposite the stem, so the imbalance would have been even greater if the sensor was mounted on the stem, as a lot are. I don't know if this is an earth-shattering revelation, but I sure found it interesting.
BTW - The final balance called for about 0.75 oz of weight inside and outside at roughly the same place as the original imbalance spot.
