275/40 R20 vs 295/35 R21
275/40 R20 vs 295/35 R21
295/35 R21 stays within the configured tolerance for 275/40 R20: +1.6% diameter and +1.6% speedometer effect.
Fitment verdict
295/35 R21 stays within the configured tolerance for 275/40 R20: +1.6% diameter and +1.6% speedometer effect.
| Metric | This size: 275/40 R20 | Alternative: 295/35 R21 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 28.66 in | 29.13 in | +1.6% | Within tolerance |
| Section width | 10.83 in | 11.61 in | +0.79 in | Computed difference |
| Sidewall height | 4.33 in | 4.06 in | -0.27 in | Computed difference |
| Circumference | 90.04 in | 91.51 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% (+0.47 in) · US (~3%)
- Within tolerance · Diameter +1.6%.
- Speedo @ 60: 60 mph → 61.0 mph.
- Sidewall -0.27 in · Width +0.79 in.
Diameter+1.6%+0.47 in
Speedo @ 60+1.6%60 mph → 61.0 mph
Sidewall-0.27 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
- 28.66 in 29.13 in+0.47 in
- Sidewall
- 4.33 in 4.06 in-0.27 in
- Width
- 10.83 in 11.61 in+0.79 in
- Circumference
- 90.04 in 91.51 in+1.6%
- Revs / mile
- 704 692
- Speedo @ 60
- 60 mph 61.0 mph+1.6%
- Current —
275/40 R20 - New —
295/35 R21 - Grounded to the road: the axle rises +0.23 in.
Result report
275/40 R20 295/35 R21 · Within tolerance
Use this size when shopping: 295/35 R21
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 175/70R19 | -0.1% | -0.1% | |
OE 275/40R20 | +0.0% | +0.0% | |
+1″ 195/50R21 | +0.1% | +0.1% | |
+2″ 155/55R22 | +0.2% | +0.2% |
275/40 R20 · 295/35 R21 · Methodology
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.