Tires Size 315/40ZR21
Dimensions, specs, and every size 315/40ZR21 tire currently in stock
30.92"
785 mm · calculated
315 mm
12.4 inches
4.96"
126 mm · 40% profile
21"
533.4 mm
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315/40ZR21 Specifications
Read directly from the size code. Load index, speed rating, and rim width range vary by model.
| Specification | Imperial | Metric |
|---|---|---|
| Section width | 12.4 in | 315 mm |
| Aspect ratio | 40% | — |
| Sidewall height | 4.96 in | 126 mm |
| Overall diameter (calculated) | 30.92 in | 785 mm |
| Wheel / rim diameter | 21 in | 533.4 mm |
| Construction | Radial | — |
What does 315/40ZR21 mean?
Reading the code on your sidewall
315 mm
The distance from sidewall to sidewall across the tire's widest point.
40% profile
The sidewall stands 40% of the section width, which is 126 mm on this size.
Radial
The body plies run across the tire at right angles to the direction of travel.
21 in
Fits a wheel measuring 21 inches across.
315/40ZR21 Questions & Answers
Dimensions and fitment guidelines for size 315/40ZR21
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