285/50 R20 vs 265/70 R17
285/50 R20 vs 265/70 R17
265/70 R17 stays within the configured tolerance for 285/50 R20: +1.2% diameter and +1.2% speedometer effect.
Fitment verdict
265/70 R17 stays within the configured tolerance for 285/50 R20: +1.2% diameter and +1.2% speedometer effect.
| Metric | This size: 285/50 R20 | Alternative: 265/70 R17 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 31.22 in | 31.61 in | +1.2% | Within tolerance |
| Section width | 11.22 in | 10.43 in | -0.79 in | Computed difference |
| Sidewall height | 5.61 in | 7.30 in | +1.69 in | Computed difference |
| Circumference | 98.08 in | 99.29 in | +1.2% | Within tolerance |
| Speedo | 0.0% | +1.2% | +1.2% | Within tolerance |
Compare sizes
Looks valid
Looks valid
Units
✓ Within toleranceDiameter +1.2% (+0.39 in) · US (~3%)
- Within tolerance · Diameter +1.2%.
- Speedo @ 60: 60 mph → 60.7 mph.
- Sidewall +1.69 in · Width -0.79 in.
Diameter+1.2%+0.39 in
Speedo @ 60+1.2%60 mph → 60.7 mph
Sidewall+1.69 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
- 31.22 in 31.61 in+0.39 in
- Sidewall
- 5.61 in 7.30 in+1.69 in
- Width
- 11.22 in 10.43 in-0.79 in
- Circumference
- 98.08 in 99.29 in+1.2%
- Revs / mile
- 646 638
- Speedo @ 60
- 60 mph 60.7 mph+1.2%
- Current —
285/50 R20 - New —
265/70 R17 - Grounded to the road: the axle rises +0.19 in.
Result report
285/50 R20 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″ 345/45R19 | +0.0% | +0.0% | |
OE 285/50R20 | +0.0% | +0.0% | |
+1″ 325/40R21 | +0.1% | +0.1% | |
+2″ 195/60R22 | -0.0% | -0.0% |
285/50 R20 · 265/70 R17 · Methodology
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.