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Up to 66% Off Select Tires

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Receive 20% off select tires with promo code ROLLOUT20 when scheduled for installation on PepBoys.com and installation is completed between 7/26/15 through 8/01/15. Not valid in combination with any other discounts or promotions. Valid on select in stock tires only, those tires for which discount is available will be identified in search results, all other tires and special order tires are excluded from this offer. Requires purchase of road hazard warranty and tire installation package which includes valve stems or TPMS reseal kit and balancing.

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
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