the wear should come in numbers such as 100, 200, 300, 400 etc.
the higher the number, the longer the tire SHOULD last... for instance:
I used to have a tire that was rated at 180 treadwear... it last me about 18k miles before i had to replace them. When i replaced them I went with a 400 treadwear rating. Im almost at 40k miles on these tires. The next tires im getting will be rated at 300 so im hopin to get around 30k out of them. Make sense?