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JFGI.

The treadwear grade describes how long the tire manufacturer expects the tire to last. A Course Monitoring Tire (the standard tire that a test tire will be compared to) has a rating of "100". If a manufacturer assigns a treadwear rating of 200 to a new tire, they are indicating that they expect the new tire to have a useful lifespan that is 200% of the life of a Course Monitoring Tire.
 

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basically it's a % of how long the tire will last. as stated above. you take this xxx% number and multiply it by 7,200

100% means the tire will last 7,200 miles, 200% means 14,400 miles so on and so forth. my tire is an touring tire with 645%
 
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