From the
Bridgestone website:
Platinum Pact
The Platinum Pact Limited Warranty covers all Bridgestone brand passenger and light truck tires—except winter, and “temporary use” spare tires. A tire covered by the Platinum Pact Limited Warranty will be replaced with an equivalent new tire either free of charge or for a pro-rated amount
if the tire becomes unusable for any reason within the manufacturer’s control under the following conditions:
• The free tire replacement period extends up to (a) 3 years from the date of purchase—proof of purchase date required, or (b) 4 years from the date of tire manufacture without proof of purchase date. During this period, the tire will be replaced free of charge (including mounting and balancing). You may be charged applicable taxes, the cost of valve stems, and disposal fees.
• After the free tire replacement period, coverage extends up to (a) 5 years from the date of purchase—proof of purchase date required, ,or (b) 6 years from the date of tire manufacture without proof of purchase date. During this period, the tire will be replaced but there will be a pro-rated charge. To determine the replacement price, the percent of tread wear is multiplied by DEALER’S then current selling price for the replacement tire(s). The appropriate taxes, mounting, balancing, disposal fees, and other service charges may be added to the replacement price.
• The tire must not be worn to 2/32 inch (1.6 mm) or less remaining original tread depth (i.e. worn down to the top of the built-in indicators in the tread grooves).
• Exclusions apply—as identified in the section “What This Limited Warranty Does Not Cover.”