#ZBRUSH 4R8 RIRE TREAD DRIVER#
Driver habit: The tires of a driver who doesn’t drive aggressively or brake suddenly will last longer than an aggressive driver who slams on his or her brakes. Tire design: The quality of the rubber, the design of the tread, and a variety of other factors that go into tire design all affect how long the tread will last. Treadwear can be affected by five factors: There are many factors that affect a tire’s expected life in terms of mileage. Is there a connection between treadwear and mileage? If a tire is marked with 480 treadwear, how many miles will it get? No tire dealer worth its weight in rubber will tell you how many miles any tire will get. Tire tread rating simply means that when a tire was tested against a control tire, its tread wore two, three, four or more times slower than the standard it was tested against. How does that translate to miles? It doesn’t. If a tire is rated 300, that means it is expected to wear three times faster than the 100-UTQG rated tire. UTQG treadwear rating means that the manufacturer took the tires to a testing facility, put it on a test vehicle and measured it against a standard tire with a 100 treadwear rating. Manufacturers test and rate their own tires, and they submit reports to the US DOT’s National Highway Traffic Safety Administration (NHTSA). Here’s where the treadwear number’s meaning gets a little murky.Įven though the US government requires tires to be UTQG rated, the government doesn’t assign the ratings, nor do they actually conduct the tests to assign numbers. What the tire treadwear number means is how well the tire stood up in tests against a “control set” of tires after being driven 7,200 miles on a government test track. What does it mean when a tire is rated 180 or 200 or 400, 500, or 700? Does a higher number mean that the tire is better? Tire Treadwear Ratings Explained 
Treadwear, then, refers to the expected life of a tire. As you drive on tires, the rubber slowly wears away - that’s the tread wearing away. Tire tread is only part of a tire it’s the rubber that makes direct contact with the road. Illustration source: What Is Tire Tread?įirst, let’s make sure we understand what we mean when we talk about tread. In this guide, we explain what treadwear ratings mean and how you should use them to buy tires. Most passenger vehicle tires are UTQG rated.Īlthough the intent of UTQG might have been to make tire buying simpler, when you dig into what the ratings mean, you quickly learn that the answer isn’t simple. Exceptions include winter tires, spare tires, non-passenger car tires, trailer tires, bicycle tires and some large truck tires. The UTQG (Uniform Tire Quality Grade) rating system for grading tires includes treadwear, as well as temperature and traction, covered in separate posts.Īlmost all tires in the United States are UTQG rated. The US Department of Transportation (DOT) established the tire treadwear rating system back in the 1970s to help tire buyers understand the complicated world of passenger vehicle tires. Treadwear ratings are supposed to help us determine the value of a tire and answer questions like, How long will a tire last? And, Is the tire’s expected life worth its price?
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