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GRutter · 10-17-2021, 12:37 PM

Tires go through several post production tests.

The first is done on a Tire Uniformity Machine that measures radial and lateral runout. Radial Runout measures the forces created by "less flexible" areas of the tire created by splices in the inner-liner, plies, and tread splices during tire construction. These splices are staggered during construction, but they result in areas where the tire is less flexible, and even if the tire is perfectly round, result in a "feel" that the tire is out of balance because the less flexible areas push back against the suspension more than the more flexible (non-splice) areas. The radial "high point" is marked on the tire near the bead in colored wax.

Lateral runout is also measured. It is a measure of the tire wanting to pull left or right as it rotates.

The next test a tire goes through is either static or dynamic balance. The light spot on the tire is also marked with a wax dot lower on the sidewall (furher away from the bead)

10-17-2021, 12:37 PM	#12
GRutter Senior Member Join Date: Sep 2017 Location: Mint Hill, North Carolina Posts: 386	Re: Red Dot on New Tires Tires go through several post production tests. The first is done on a Tire Uniformity Machine that measures radial and lateral runout. Radial Runout measures the forces created by "less flexible" areas of the tire created by splices in the inner-liner, plies, and tread splices during tire construction. These splices are staggered during construction, but they result in areas where the tire is less flexible, and even if the tire is perfectly round, result in a "feel" that the tire is out of balance because the less flexible areas push back against the suspension more than the more flexible (non-splice) areas. The radial "high point" is marked on the tire near the bead in colored wax. Lateral runout is also measured. It is a measure of the tire wanting to pull left or right as it rotates. The next test a tire goes through is either static or dynamic balance. The light spot on the tire is also marked with a wax dot lower on the sidewall (furher away from the bead)