245/65 R18 vs 31x10.50 R16
245/65 R18 vs 31x10.50 R16
31x10.50 R16 stays within the configured tolerance for 245/65 R18: +1.5% diameter and +1.5% speedometer effect.
Geometric comparison
31x10.50 R16 stays within the configured tolerance for 245/65 R18: +1.5% diameter and +1.5% speedometer effect.
| Metric | This size: 245/65 R18 | Alternative: 31x10.50 R16 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 30.54 in | 31.00 in | +1.5% | Within tolerance |
| Section width | 9.65 in | 10.50 in | +0.85 in | Computed difference |
| Sidewall height | 6.27 in | 7.50 in | +1.23 in | Computed difference |
| Circumference | 95.94 in | 97.39 in | +1.5% | Within tolerance |
| Speedo | 0.0% | +1.5% | +1.5% | Within tolerance |
Compare sizes
Looks valid
Looks valid
Units
High fitment riskWithin tolerance · Diameter +1.5% (+0.46 in) · US (~3%)
- High fitment risk · This rating covers tire geometry only, not vehicle compatibility.
- Diameter +1.5% · Ride-height change +0.23 in.
- Speedometer reads low · 60 mph → 60.9 mph.
- Sidewall +1.23 in · Width +0.85 in.
Diameter+1.5%+0.46 in
Speedo @ 60+1.5%60 mph → 60.9 mph
Sidewall+1.23 inWidth +0.85 in
Ride-height change+0.23 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
- 30.54 in 31.00 in+0.46 in
- Sidewall
- 6.27 in 7.50 in+1.23 in
- Width
- 9.65 in 10.50 in+0.85 in
- Circumference
- 95.94 in 97.39 in+1.5%
- Revs / mile
- 660 651
- Speedo @ 60
- 60 mph 60.9 mph+1.5%
- Ride-height change
- 0.00 in +0.23 in
- True distance per 100 indicated
- 100 mi 101.5 mi+1.5%
- Current —
245/65 R18 - New —
31x10.50 R16 - Grounded to the road: the axle rises +0.23 in.
Result report
245/65 R18 31x10.50 R16 · High fitment risk · Within tolerance
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Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
In-tolerance alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 215/80R17 | +0.0% | +0.0% | |
OE 245/65R18 | +0.0% | +0.0% |
245/65 R18 · 31x10.50 R16 · Methodology
- Technical check
- 2026-06-28
What changed
- Checked generated routes, metadata, sitemap inclusion and localized page rendering.