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Buy 3 Tires, Get 4th Tire Free Instantly

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Buy 3 Tires, Get 4th Tire Free Instantly
Buy 3 Tires, Get 4th Tire Free Instantly. Receive a discount equal to the price of a single tire when four tires are added to the cart. Valid on select in stock tires only. Those tires for which discount is available will be identified in search results & product detail pages. All other tires and special order tires are excluded from this offer. Valid when scheduled for installation on PepBoys.com and installation is completed between 6/26/17 through 7/31/17.


Calculating Overall Tire Diameter

To calculate overall tire diameter, you only need the size of the tire. The formula below will help you determine the tire diameter.


     
Calculating Tire Diameter - Illustration

For example, if the tire size is 225/50R 16 the equation will be implemented as follows:

Calculating Tire Diameter - Formula