The standard warranty is pro-rated by the original dread depth worn from the tire.OK, but I still think this is the same as every tire?
If I am at half life of the tire when they fail, then I pay 1/2 the then current rate for the new tire. This has always been the case on any tire I owned.
How else would they do a pro rate?
Since this TractionComman is not warrantied by a mileage warranty it is not pro-rated the same way.
The Tire mileage warranty is determined by the actual mileage delivered by the miles warranted.
Here's Cooper's talk:
PRORATED ADJUSTMENT Tires not eligible for free replacement that are removed from service due to acovered warranty condition will be replaced with the same brand comparablenew Cooper, Mastercraft (U.S. Only) or Starfire tire on a prorated basis for upto six (6) years from the date of original new tire purchase or when thetreadwear indicators become visible (worn to 2/32"), whichever occurs first.(Without proof of purchase the date of manufacture will be used to determineeligibility.)
HOW WILL PRORATED CHARGES BE CALCULATED? Replacement price will be calculated by multiplying the tire’s advertised retailselling price at the time of adjustment by the percentage of usable originaltread that has been worn off. You pay for mounting and balancing, and anamount equal to the current Federal Excise Tax (F.E.T. – U.S. only) and anyother applicable taxes and government-mandated charges.
EXAMPLE: If your disabled tire had an original 8/32" of usable treadwear and is worn to 4/32" usable tread remaining, you have used 50% and therefore mustpay 50% of the advertised retail selling price of the comparable tire
Here they talk about Tread Life Warranty too:
the Tread Life Limited Warranty, the tires will be replaced as follows: If the tread wears evenly down to the treadwear indicators (worn to 2/32")before delivering the warranted mileage, the tire will be replaced on a prorated basis, provided the original invoice is presented showing the vehiclemileage when the tires were originally installed.
EXAMPLE: If your tire has a tread life limited warranty of 80,000 miles(130,000 kilometres) and delivers 56,000 miles (91,000 kilometres)prior to wear-out (down to 2/32"), the tire will be replaced for 70% of theadvertised selling price of the comparable tire at the time of adjustment. If the price of the new comparable tire is $130, the cost to you would be $91,plus any additional charges such as mounting, balancing and any other applicable taxes and government-mandated charges.