The Tyre Size Calculator/Tire Plus Sizing calculator helps you to find the optimal tyre size when you install larger wheels on a car. It calculates the tyre dimensions for plus sizing. 

The tyre plus sizing or the tyre upsizing is the procedure of replacing a wheel with a larger one and mounting a lower profile tyre while keeping an overall diameter and a tyre circumference the same or approximately the same as it is for the original equipment (OE) tyre. 

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