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%
my other ride is an ambulance!
1997 V8 sport - first car - sold 6/7/10
2006 silver mustang gt premiumcustom made grill, frpp shorty headers, pypes cat back exhaust, hurst billet pro shifter,