Rock Products

MAY 2019

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www.rockproducts.com ROCK products • May 2019 • 39 With this evaluation, you can run two trucks with eight wheel positions. The key is doing an X-pattern (or cross-axle) on the two rear axles. (Refer to TMC RP230B "Tire Test Procedures for Tread Wear, Serviceability and Fuel Economy.) However, don't run the tires identically on the two trucks as different positions tend to have different wear rates. For example, tires on the trailing axle typically wear faster than the forward axle, and there can be side-to-side differences. So, be sure to reverse the X pattern from one evaluation truck to the next truck. Trailer Tire Evaluation To evaluate trailer tires, follow the same procedure as for drive tires. In order to effectively track trailer mileages, install hubom- eters on the trailers being used for the evaluation. Even in a fleet where trailers typically stay with a given tractor, there is a chance that tractor and trailer could get separated from each other, and you would lose track of trailer mileages. Maintenance Practices Once tires are mounted, start the evaluation off properly by having each vehicle undergo a total vehicle alignment on the front and rear axles. Once that's done, you should not have to do a re-alignment during the evaluation period unless you detect irregular wear, or have a suspension issue with a vehicle. It's important to have the drivers conduct proper pre-and post-trip inspections. And, that means tire inflation needs to be checked properly – not with a tire thumper. Tires need to be gauged to ensure tire inflation pressure is at the pre-de- fined level for the specific position. To make it easy on your drivers, install flow-through valve caps, so they don't have to spend time taking off valve caps.

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