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Which Runs Cooler a Bias Ply or a Radial Tire  

Question:

A previous answer states that a radial runs cooler than a bias ply but flexes more. It is my understanding that more flex equals more heat. This seems to be a contradiction. Can you elaborate?

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Expert Reply:

Flex can create heat, but due to the construction of bias ply tires (stiffer sidewalls and different ply angle), more heat is created with a bias-ply than a radial.

It's basically about friction. The tire is going to flex as it travels down the road. But a tire that is more difficult to flex (bias ply), will create more friction as it is forced to flex therefore it will create more heat.

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Jameson C

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