tyre size

Automotive tires are described by an alphanumeric tire code (in North American English) or tyre code (in Commonwealth English), which is generally molded into the sidewall of the tire. This code specifies the dimensions of the tire, and some of its key limitations, such as load-bearing ability, and maximum speed. Sometimes the inner sidewall contains information not included on the outer sidewall, and vice versa.
The code has grown in complexity over the years, as is evident from the mix of SI and USC units, and ad-hoc extensions to lettering and numbering schemes. New automotive tires frequently have ratings for traction, treadwear, and temperature resistance, all collectively known as the Uniform Tire Quality Grading.
Most tires sizes are given using the ISO metric sizing system. However, some pickup trucks and SUVs use the Light Truck Numeric or Light Truck High Flotation system.

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  1. takhy

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    Hi! I tried changing to winter wheels today on my MG4 trophy extended range. The winter wheels are 215/50 R17 size and seem to be pressing down on the calipers in the front. Is this size too small? Manual tells me it should be good. Thanks in advance.
    • takhy
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    • Replies: 3
    • Forum: MG4 EV Forum
  2. B

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  3. mechfurkan

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  4. L

    Tyre size?

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  5. P

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  6. MeteUlk

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  7. A

    Another tyre question

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  8. D

    Tyre size

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  9. C

    Snow & Tyre Size

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