Tires Size 315/30R21
Dimensions, specs, and every size 315/30R21 tire currently in stock
28.44"
722 mm · calculated
315 mm
12.4 inches
3.72"
94.5 mm · 30% profile
21"
533.4 mm
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315/30R21 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 | 30% | — |
| Sidewall height | 3.72 in | 94.5 mm |
| Overall diameter (calculated) | 28.44 in | 722 mm |
| Wheel / rim diameter | 21 in | 533.4 mm |
| Construction | Radial | — |
What does 315/30R21 mean?
Reading the code on your sidewall
315 mm
The distance from sidewall to sidewall across the tire's widest point.
30% profile
The sidewall stands 30% of the section width, which is 94.5 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.
315/30R21 Questions & Answers
Dimensions and fitment guidelines for size 315/30R21
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