245/35 R20 vs 255/40 R19
245/35 R20 vs 255/40 R19
255/40 R19 stays within the configured tolerance for 245/35 R20: +1.0% diameter and +1.0% speedometer effect.
Fitment verdict
255/40 R19 stays within the configured tolerance for 245/35 R20: +1.0% diameter and +1.0% speedometer effect.
| Metric | This size: 245/35 R20 | Alternative: 255/40 R19 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 26.75 in | 27.03 in | +1.0% | Within tolerance |
| Section width | 9.65 in | 10.04 in | +0.39 in | Computed difference |
| Sidewall height | 3.38 in | 4.02 in | +0.64 in | Computed difference |
| Circumference | 84.04 in | 84.92 in | +1.0% | Within tolerance |
| Speedo | 0.0% | +1.0% | +1.0% | Within tolerance |
Compare sizes
Looks valid
Looks valid
Units
✓ Within toleranceDiameter +1.0% (+0.28 in) · US (~3%)
- Within tolerance · Diameter +1.0%.
- Speedo @ 60: 60 mph → 60.6 mph.
- Sidewall +0.64 in · Width +0.39 in.
Diameter+1.0%+0.28 in
Speedo @ 60+1.0%60 mph → 60.6 mph
Sidewall+0.64 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
- 26.75 in 27.03 in+0.28 in
- Sidewall
- 3.38 in 4.02 in+0.64 in
- Width
- 9.65 in 10.04 in+0.39 in
- Circumference
- 84.04 in 84.92 in+1.0%
- Revs / mile
- 754 746
- Speedo @ 60
- 60 mph 60.6 mph+1.0%
- Current —
245/35 R20 - New —
255/40 R19 - Grounded to the road: the axle rises +0.14 in.
Result report
245/35 R20 255/40 R19 · Within tolerance
Use this size when shopping: 255/40 R19
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 245/40R19 | -0.1% | -0.1% | |
OE 245/35R20 | +0.0% | +0.0% | |
+1″ 245/30R21 | +0.1% | +0.1% | |
+2″ 135/45R22 | +0.1% | +0.1% |
245/35 R20 · 255/40 R19 · Methodology
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.