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The treadwear rating of a tire is a reflection of the expected lifespan of the tire. The higher the treadwear rating, the longer the tire should last.
This rating is based on comparison with a "Course Monitoring Tire" (CMT)with an assigned treadwear of "100." A tire with 300 treadwear should last three times longer than the CMT.
However, most manufacturers use this rating as a marketing technique. This means that many treadwear numbers are stated higher than "actual" to give an advantage over a competing tire/brand. Treadwear numbers, however, can usually be reliable when comparing different tire offerings from the same manufacturer.
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∙ 15y ago
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Is a tire with a tread wear of 400 good?
Short answer is that 400 is about average and not the best you can get. Because treadwear ratings are assigned by tire manufacturers, comparisons are most effective between a specific manufacturer's products rather than across brands. A tire with a treadwear rating of 400, for example, is likely to last twice as long as a tire rated at 200. So really you can only compare treadwear ratings as long as you are looking at the same brand. A tire with a rating of 400 should last around 40,000 miles but that will depend on many factors. How you drive, how often they are rotated and balanced, if you keep them inflated properly, where you drive, etc.
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