285/60 R18 vs 265/70 R17
285/60 R18 vs 265/70 R17
265/70 R17 stays within the configured tolerance for 285/60 R18: +0.5% diameter and +0.5% speedometer effect.
Fitment verdict
265/70 R17 stays within the configured tolerance for 285/60 R18: +0.5% diameter and +0.5% speedometer effect.
| Metric | This size: 285/60 R18 | Alternative: 265/70 R17 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 31.46 in | 31.61 in | +0.5% | Within tolerance |
| Section width | 11.22 in | 10.43 in | -0.79 in | Computed difference |
| Sidewall height | 6.73 in | 7.30 in | +0.57 in | Computed difference |
| Circumference | 98.85 in | 99.29 in | +0.5% | Within tolerance |
| Speedo | 0.0% | +0.5% | +0.5% | Within tolerance |
Compare sizes
Looks valid
Looks valid
Units
✓ Within toleranceDiameter +0.5% (+0.14 in) · US (~3%)
- Within tolerance · Diameter +0.5%.
- Speedo @ 60: 60 mph → 60.3 mph.
- Sidewall +0.57 in · Width -0.79 in.
Diameter+0.5%+0.14 in
Speedo @ 60+0.5%60 mph → 60.3 mph
Sidewall+0.57 inWidth -0.79 in
How this result is calculated
Computed from nominal tire-size geometry: diameter, circumference and speedometer error. It does not check wheel-arch, suspension or brake clearance.
Methodology- Diameter
- 31.46 in 31.61 in+0.14 in
- Sidewall
- 6.73 in 7.30 in+0.57 in
- Width
- 11.22 in 10.43 in-0.79 in
- Circumference
- 98.85 in 99.29 in+0.5%
- Revs / mile
- 641 638
- Speedo @ 60
- 60 mph 60.3 mph+0.5%
- Current —
285/60 R18 - New —
265/70 R17 - Grounded to the road: the axle rises +0.07 in.
Result report
285/60 R18 265/70 R17 · Within tolerance
Use this size when shopping: 265/70 R17
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 245/75R17 | +0.0% | +0.0% | |
OE 285/60R18 | +0.0% | +0.0% | |
+1″ 265/60R19 | +0.2% | +0.2% | |
+2″ 265/55R20 | +0.0% | +0.0% |
285/60 R18 · 265/70 R17 · Methodology
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.