225/45 R17 vs 255/35 R18
225/45 R17 vs 255/35 R18
255/35 R18 stays within the configured tolerance for 225/45 R17: +0.2% diameter and +0.2% speedometer effect.
Fitment verdict
255/35 R18 stays within the configured tolerance for 225/45 R17: +0.2% diameter and +0.2% speedometer effect.
| Metric | This size: 225/45 R17 | Alternative: 255/35 R18 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 24.97 in | 25.03 in | +0.2% | Within tolerance |
| Section width | 8.86 in | 10.04 in | +1.18 in | Computed difference |
| Sidewall height | 3.99 in | 3.51 in | -0.47 in | Computed difference |
| Circumference | 78.45 in | 78.63 in | +0.2% | Within tolerance |
| Speedo | 0.0% | +0.2% | +0.2% | Within tolerance |
Compare sizes
Looks valid
Looks valid
Units
✓ Within toleranceDiameter +0.2% (+0.06 in) · US (~3%)
- Within tolerance · Diameter +0.2%.
- Speedo @ 60: 60 mph → 60.1 mph.
- Sidewall -0.47 in · Width +1.18 in.
Diameter+0.2%+0.06 in
Speedo @ 60+0.2%60 mph → 60.1 mph
Sidewall-0.47 inWidth +1.18 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
- 24.97 in 25.03 in+0.06 in
- Sidewall
- 3.99 in 3.51 in-0.47 in
- Width
- 8.86 in 10.04 in+1.18 in
- Circumference
- 78.45 in 78.63 in+0.2%
- Revs / mile
- 808 806
- Speedo @ 60
- 60 mph 60.1 mph+0.2%
- Current —
225/45 R17 - New —
255/35 R18 - Grounded to the road: the axle rises +0.03 in.
Result report
225/45 R17 255/35 R18 · Within tolerance
Use this size when shopping: 255/35 R18
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 285/40R16 | +0.0% | +0.0% | |
OE 225/45R17 | +0.0% | +0.0% | |
+1″ 295/30R18 | -0.0% | -0.0% | |
+2″ 305/25R19 | +0.1% | +0.1% |
225/45 R17 · 255/35 R18 · Methodology
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.