We recommend that the replacement tires match the speed symbol of the original tires because these match the speed capability of the vehicle. The 300 is treadwear, which represents the tire s comparative wear when measured against the government-mandated tire which is rated at 100. So this tire wore three times longer than the control tire. Traction indicates the level of grip the tire possesses. Temperature rating deals with the tire s ability to disperse built-up heat.
Heat causes rubber to deteriorate over time, so dispersing heat increases tire life.
Each tire manufacturer determines UTQG ratings for their products. Realize that UTQGs are more accurate when comparing tires within the same line versus tires from two different makers. Because tires may have warranties as high as 80,000 miles or more, the period after the sale may be several years. Tire professionals help you maximize your investment and get the right tire for your driving needs. Buy your tires where the sales force helps you, not just sells you.