225/40 R18 vs 235/35 R19
225/40 R18 vs 235/35 R19
235/35 R19 stays within the configured tolerance for 225/40 R18: +1.6% diameter and +1.6% speedometer effect.
Fitment verdict
235/35 R19 stays within the configured tolerance for 225/40 R18: +1.6% diameter and +1.6% speedometer effect.
| Metric | This size: 225/40 R18 | Alternative: 235/35 R19 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 25.09 in | 25.48 in | +1.6% | Within tolerance |
| Section width | 8.86 in | 9.25 in | +0.39 in | Computed difference |
| Sidewall height | 3.54 in | 3.24 in | -0.31 in | Computed difference |
| Circumference | 78.81 in | 80.04 in | +1.6% | Within tolerance |
| Speedo | 0.0% | +1.6% | +1.6% | Within tolerance |
Compare sizes
Looks valid
Looks valid
Units
✓ Within toleranceDiameter +1.6% (+0.39 in) · US (~3%)
- Within tolerance · Diameter +1.6%.
- Speedo @ 60: 60 mph → 60.9 mph.
- Sidewall -0.31 in · Width +0.39 in.
Diameter+1.6%+0.39 in
Speedo @ 60+1.6%60 mph → 60.9 mph
Sidewall-0.31 inWidth +0.39 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
- 25.09 in 25.48 in+0.39 in
- Sidewall
- 3.54 in 3.24 in-0.31 in
- Width
- 8.86 in 9.25 in+0.39 in
- Circumference
- 78.81 in 80.04 in+1.6%
- Revs / mile
- 804 792
- Speedo @ 60
- 60 mph 60.9 mph+1.6%
- Current —
225/40 R18 - New —
235/35 R19 - Grounded to the road: the axle rises +0.19 in.
Result report
225/40 R18 235/35 R19 · Within tolerance
Use this size when shopping: 235/35 R19
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 205/50R17 | -0.1% | -0.1% | |
OE 225/40R18 | +0.0% | +0.0% | |
+1″ 155/50R19 | +0.1% | +0.1% | |
+2″ 215/30R20 | -0.0% | -0.0% |
225/40 R18 · 235/35 R19 · Methodology
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.