Tires Size 255/40R21
Dimensions, specs, and every size 255/40R21 tire currently in stock
29.04"
738 mm · calculated
255 mm
10.04 inches
4.02"
102 mm · 40% profile
21"
533.4 mm
2 products
In stock · Free shipping on every order
In stock · Free shipping on every order
Showing 1 to 2 of 2 products
255/40R21 Specifications
Read directly from the size code. Load index, speed rating, and rim width range vary by model.
| Specification | Imperial | Metric |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Aspect ratio | 40% | — |
| Sidewall height | 4.02 in | 102 mm |
| Overall diameter (calculated) | 29.04 in | 738 mm |
| Wheel / rim diameter | 21 in | 533.4 mm |
| Construction | Radial | — |
What does 255/40R21 mean?
Reading the code on your sidewall
255 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 102 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.
255/40R21 Questions & Answers
Dimensions and fitment guidelines for size 255/40R21
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