235/40 R18 vs 235/35 R19
235/40 R18 vs 235/35 R19
235/35 R19 stays within the configured tolerance for 235/40 R18: +0.3% diameter and +0.3% speedometer effect.
Fitment verdict
235/35 R19 stays within the configured tolerance for 235/40 R18: +0.3% diameter and +0.3% speedometer effect.
| Metric | This size: 235/40 R18 | Alternative: 235/35 R19 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 25.40 in | 25.48 in | +0.3% | Within tolerance |
| Section width | 9.25 in | 9.25 in | 0.00 in | Computed difference |
| Sidewall height | 3.70 in | 3.24 in | -0.46 in | Computed difference |
| Circumference | 79.80 in | 80.04 in | +0.3% | Within tolerance |
| Speedo | 0.0% | +0.3% | +0.3% | Within tolerance |
Compare sizes
Looks valid
Looks valid
Units
✓ Within toleranceDiameter +0.3% (+0.07 in) · US (~3%)
- Within tolerance · Diameter +0.3%.
- Speedo @ 60: 60 mph → 60.2 mph.
- Sidewall -0.46 in · Width +0.00 in.
Diameter+0.3%+0.07 in
Speedo @ 60+0.3%60 mph → 60.2 mph
Sidewall-0.46 inWidth +0.00 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
- 25.40 in 25.48 in+0.07 in
- Sidewall
- 3.70 in 3.24 in-0.46 in
- Width
- 9.25 in 9.25 in+0.00 in
- Circumference
- 79.80 in 80.04 in+0.3%
- Revs / mile
- 794 792
- Speedo @ 60
- 60 mph 60.2 mph+0.3%
- Current —
235/40 R18 - New —
235/35 R19 - Grounded to the road: the axle rises +0.04 in.
Result report
235/40 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″ 305/35R17 | +0.0% | +0.0% | |
OE 235/40R18 | +0.0% | +0.0% | |
+1″ 125/65R19 | -0.0% | -0.0% | |
+2″ 125/55R20 | +0.0% | +0.0% |
235/40 R18 · 235/35 R19 · Methodology
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.