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What is the difference between a ZR tire size and an R tire size?

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In both the ZR and R, R means radial. Nearly all passenger tires today are Radial.
Z is the speed rating of the tire. Z rated tires are high performance tires. The Z designation is not important in selecting tire chains.
In other words ZR and R use the same chains.

http://www.tirechain.com/

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