What do the "treadwear" numbers mean for tires? Like 300 compared to 500 as an example.
by 
Blackberry.
ANSWERS: 3
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Tread wear: "This number comes from testing the tire in controlled conditions on a government test track. The higher the number, the longer you can expect the tread to last. Since no one will drive his or her car on exactly the same surfaces and at the same speeds as the government test track, the number is not an accurate indicator of how long your tread will actually last. It's a good relative measure, however: You can expect a tire with a larger number to last longer than one with a smaller number. " Much more useful info here: http://auto.howstuffworks.com/tire2.htm
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It's supposed to be a measure of how long the tire will last compared to an average tire. However manufacturers inflate treadwear numbers just as certainly as they do tires. So in fact, it means little or nothing. http://en.wikipedia.org/wiki/Treadwear_rating
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It's a comparison for how long the tire will last, though these days most tires are sold guarantees based on mileage. Treadwear ranking are relative. A tire with a ranking of 400 could be expected to run twice as long as a tire of 200 under similar ciorcumstances. Longevity is also affected by the type of car, driving style, environmental factors, maintenance, etc., so it's useful only for comparison at the tire store. It's not as simple as simply picking the highest number. Other factors include ride quality, traction, wet or ice traction, etc. and it's a matter of balancing the different considerations.
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