15-inch rim · dimensions and fitment reference
31x10.50 R15 tyre size
31x10.50 R15 has a nominal diameter of 787.4 mm (31 inches) and a 203.2 mm sidewall. Check the dimensions, car-guide matches and neighbouring rim-size alternatives below.
31x10.50 R15 dimensions
| Measurement | Millimetres | Inches |
|---|---|---|
| Overall diameter | 787.4 | 31 |
| Sidewall height | 203.2 | 8 |
| Section width | 266.7 | 10.5 |
| Circumference | 2,473.69 | 97.39 |
| Rim diameter | 381 | 15 |
- Revolutions per kilometre
- 404.25
- Revolutions per mile
- 650.58
Calculated from the nominal size, without load or tread wear. Revolutions use nominal circumference, not a measured rolling circumference. Tyre model, inflation, load and rim width can change the real dimensions.
Reading the size
This flotation marking gives overall diameter and section width in inches, followed by R for radial construction and the 15-inch rim diameter. We convert those nominal dimensions to millimetres for comparison. For the load index, speed rating and date code that follow the size, read how to read a tyre size.
Rim-width starting range
Check the tyre maker’s specification
The existing passenger-car guidance does not cover this tyre type. No estimated approval range is shown for flotation or commercial sizes. Our guide to choosing wheel width for a tyre explains how to find the approved range.
Read the rim-width tool’s limitsExplained in our guides
- Lifted truck wheel fitment: backspacing, 33s, 35s and trimmingPlan larger truck tyres around lift-kit requirements, backspacing, steering and articulation. Compare 33 and 35 inch tyres without assuming a lift guarantees clearance.
- How to read a tyre size, load index and sidewall markingsDecode tyre width, aspect ratio, rim diameter, load and speed markings, then calculate sidewall height and diameter using a 225/45 R17 example.
- Plus-sizing wheels: tyre diameter and speedometer changesWork through a 17 to 18 inch wheel change, compare tyre diameters and speedometer effects, and understand why a 3% rule cannot approve fitment.
Plus-size and minus-size alternatives
Computed candidates within ±3% of the 787.4 mm diameter, on 14-inch and 16-inch rims. Width stays within 20 mm of this tyre, using 165 to 355 mm widths in 10 mm steps and 25 to 80% profiles in 5% steps. These combinations are not a stock list or fitment approval; check availability and the exact tyre specification.
Minus one: 14-inch rims
| Candidate size | Diameter | Change | Compare |
|---|---|---|---|
| 285/75 R14 | 783.1 mm | -0.55% | Compare sizes |
| 265/80 R14 | 779.6 mm | -0.99% | Compare sizes |
| 275/80 R14 | 795.6 mm | +1.04% | Compare sizes |
| 275/75 R14 | 768.1 mm | -2.45% | Compare sizes |
Plus one: 16-inch rims
| Candidate size | Diameter | Change | Compare |
|---|---|---|---|
| 255/75 R16 | 788.9 mm | +0.19% | Compare sizes |
| 275/70 R16 | 791.4 mm | +0.51% | Compare sizes |
| 265/70 R16 | 777.4 mm | -1.27% | Compare sizes |
| 285/65 R16 | 776.9 mm | -1.33% | Compare sizes |
| 265/75 R16 | 803.9 mm | +2.1% | Compare sizes |
| 285/70 R16 | 805.4 mm | +2.29% | Compare sizes |
| 275/65 R16 | 763.9 mm | -2.98% | Compare sizes |
How a size change moves the speedometer and gearing is covered in plus-sizing wheels. A smaller rim must still clear the brakes. Check wheel width, offset, load and speed ratings, full steering and suspension travel, and vehicle restrictions. AWD and staggered cars may need a much tighter rolling-circumference match than this screening limit.
Cars and setups listing 31x10.50 R15
Use the trim, market and axle as well as the car name. Each guide links to its supporting sources and explains clearance limits.
Factory trims
| Car | Trim | Axle |
|---|---|---|
| Nissan Patrol / Safari Y60 / GQ (1987–1997) | Wide-wheel 15-inch package | Front and rear |
Popular community setups
| Car | Setup | Axle |
|---|---|---|
| Jeep Cherokee XJ (1984–2001) | Lifted 31-inch trail setup | Front and rear |
| Jeep Wrangler TJ / LJ (1997–2006) | 31-inch daily and trail | Front and rear |
Questions
How tall is a 31x10.50 R15 tyre?
Its nominal overall diameter is 787.4 mm (31 inches). Sidewall height is 203.2 mm. These are size-code calculations; actual dimensions vary by tyre model, rim and operating conditions.
What rim width should I use for 31x10.50 R15?
Our passenger-car rim-width estimate does not cover this tyre type. Use the tyre manufacturer's approved rim-width range for the exact size, construction and model.
Can I replace 31x10.50 R15 with one of the alternatives?
The alternatives only match nominal diameter within 3% on a rim one inch smaller or larger. That does not approve fitment. Confirm that the size is manufactured, then check load and speed ratings, rim width, brakes, bodywork clearance, vehicle approval and any AWD requirements.
Which cars use 31x10.50 R15?
3 car guides list this size. The tables separate factory trims from community setups and identify the axle. A popular setup is not a factory tyre approval.
Check the exact tyre
For how measured dimensions and approved rim ranges differ from nominal calculations, see Tire Rack’s tyre specification guide.