31x10.50R15 tire size
31x10.50R15 (an inch (flotation) size) is 31.00 in tall and 10.50 in wide, with a 8.00 in sidewall, and is made for a 15-inch wheel.
| Measurement | Imperial | Metric |
|---|---|---|
| Overall diameter (height) | 31.00 in | 787 mm |
| Section width | 10.50 in | 267 mm |
| Sidewall height | 8.00 in | 203 mm |
| Rim (wheel) diameter | 15 in | 381 mm |
| Aspect ratio | 76.2% | — |
| Circumference | 97.4 in | 2474 mm |
| Revolutions | 651 per mile | 404 per km |
Compare 31x10.50R15 with any other size →
31x10.50R15 in metric
31x10.50R15 is 31.00 in tall and 10.50 in (267 mm) wide on a 15-inch rim. Closest metric sizes on the same rim:
| Size | Diameter | Width | vs original |
|---|---|---|---|
| 255/80R15 | 31.06 in | 10.04 in | +0.20% |
| 275/75R15 | 31.24 in | 10.83 in | +0.77% |
| 295/70R15 | 31.26 in | 11.61 in | +0.84% |
| 285/70R15 | 30.71 in | 11.22 in | −0.94% |
| 265/75R15 | 30.65 in | 10.43 in | −1.13% |
| 235/85R15 | 30.73 in | 9.25 in | −0.88% |
| 245/85R15 | 31.40 in | 9.65 in | +1.28% |
| 305/65R15 | 30.61 in | 12.01 in | −1.26% |
| 245/80R15 | 30.43 in | 9.65 in | −1.83% |
| 265/80R15 | 31.69 in | 10.43 in | +2.24% |
Computed combinations of standard widths and aspect ratios; not every size is manufactured. A similar diameter does not mean a size fits or is approved for your vehicle.
Sizes on other wheels with nearly the same height
From our size pages, these stay within ±3% of 31x10.50R15's diameter:
Height difference to other sizes on this site
| Other size | Height difference | True speed at 60 mph indicated | Diameter vs ±3% rule of thumb |
|---|---|---|---|
| 265/75R15 | −0.35 in (−1.1%) | 59.3 mph | inside |
Speeds assume the speedometer was accurate on 31x10.50R15.
Geometry only: this does not confirm that a size fits, is approved for or is safe on a particular vehicle. Wheel width and offset, suspension, clearances, load index, speed rating, the vehicle maker's specification and local regulations all apply — check with your owner's manual and a qualified tire professional.
Detailed comparisons
Frequently asked questions
How tall is a 31x10.50R15 tire?
31.00 inches (787 mm) in nominal overall diameter. Measured height varies slightly by brand and model and decreases as the tread wears.
What is 31x10.50R15 in metric?
It is 787 mm tall and 267 mm wide on a 15-inch wheel. The closest standard metric sizes on the same wheel are 255/80R15, 275/75R15, 295/70R15 — see the table above for the exact differences.
How many revolutions per mile does a 31x10.50R15 make?
About 651 revolutions per mile (404 per km) from its nominal circumference of 97.4 in. Manufacturer-measured values are slightly higher because the loaded tire deflects.
Nominal dimensions computed from the size code; see methodology. Always confirm load index, speed rating and fitment for your vehicle.
Related tools
- Tire size comparison
Two sizes side by side, to scale, with speedometer and RPM tables.
- Speedometer error calculator
How fast you are really going after a tire change.
- Plus size calculator
Sizes that keep your diameter on a bigger or smaller wheel.
- Tire size chart
Common sizes by wheel diameter with heights and widths.