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315/45R21 size tyre prices range from $0 to $0 depending on Quality, Brand & location in Australia.

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What does my tyre size 315/45R21 mean?

Tyre sizing can be confusing - but let's quickly break it down for you.

Tyre Width image Width
315
Tyre Profile image Profile
45
Tyre Rim image Rim
21
  • The 315 size the width of the tyre which means 315mm - How wide the tyre is across the tread.
  • The 45 represents the tyres profile height, indicating the distance from the rim's edge to the road's surface. This number is a percentage of the tyre width, meaning that for a tyre with a width of 315mm, the sidewall height would be 45% of that, equaling 141.75mm.
  • The 21 means 21 inches - This is the diameter of the wheel rim from edge to edge.

Understanding tyre sizes can be tricky, but hopefully, this explanation has clarified the meaning behind the numbers on your tyres.

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