235/70 R17 vs 31x10.50 R15
235/70 R17 vs 31x10.50 R15
31x10.50 R15 is outside the configured tolerance for 235/70 R17: +3.5% diameter and +3.5% speedometer effect.
Geometric comparison
31x10.50 R15 is outside the configured tolerance for 235/70 R17: +3.5% diameter and +3.5% speedometer effect.
| Metric | This size: 235/70 R17 | Alternative: 31x10.50 R15 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 29.95 in | 31.00 in | +3.5% | Too tall |
| Section width | 9.25 in | 10.50 in | +1.25 in | Computed difference |
| Sidewall height | 6.48 in | 8.00 in | +1.52 in | Computed difference |
| Circumference | 94.10 in | 97.39 in | +3.5% | Too tall |
| Speedo | 0.0% | +3.5% | +3.5% | Outside tolerance |
Compare sizes
Looks valid
Looks valid
Units
High fitment riskOut of tolerance · Diameter +3.5% (+1.05 in) · US (~3%)
- High fitment risk · This rating covers tire geometry only, not vehicle compatibility.
- Diameter +3.5% · Ride-height change +0.52 in.
- Speedometer reads low · 60 mph → 62.1 mph.
- Sidewall +1.52 in · Width +1.25 in.
Diameter+3.5%+1.05 in
Speedo @ 60+3.5%60 mph → 62.1 mph
Sidewall+1.52 inWidth +1.25 in
Ride-height change+0.52 inDiameter ÷ 2
How this result is calculated
Computed from nominal tire-size geometry: diameter, circumference and speedometer error. It does not check vehicle placard approval, load/speed rating, rim-width range, wheel-arch, suspension or brake clearance.
MethodologyBefore fitting
- Check the vehicle placard and owner’s manual first.
- Match or exceed the required load index and speed rating.
- Confirm rim-width range, bolt pattern, hub bore, offset and fasteners.
- Inspect wheel-arch, suspension and brake clearance under real vehicle load.
- Check TPMS, cold pressure and local roadworthiness rules.
- Diameter
- 29.95 in 31.00 in+1.05 in
- Sidewall
- 6.48 in 8.00 in+1.52 in
- Width
- 9.25 in 10.50 in+1.25 in
- Circumference
- 94.10 in 97.39 in+3.5%
- Revs / mile
- 673 651
- Speedo @ 60
- 60 mph 62.1 mph+3.5%
- Ride-height change
- 0.00 in +0.52 in
- True distance per 100 indicated
- 100 mi 103.5 mi+3.5%
- Current —
235/70 R17 - New —
31x10.50 R15 - Grounded to the road: the axle rises +0.52 in.
Result report
235/70 R17 31x10.50 R15 · High fitment risk · Out of tolerance
Copy/print uses this page state only; TireFitLab does not create an account or store a server-side report.
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
In-tolerance alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
OE 235/70R17 | +0.0% | +0.0% |
235/70 R17 · 31x10.50 R15 · Methodology
- Technical check
- 2026-06-28
What changed
- Checked generated routes, metadata, sitemap inclusion and localized page rendering.