295/40 R20
What size is 295/40 R20?
295/40 R20 has an overall diameter of about 29.29 in, a section width of 11.61 in and a sidewall height of 4.65 in. It turns roughly 689 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 29.29 in.
- Section width: 11.61 in.
- Sidewall height: 4.65 in.
- Revolutions: 428 /km · 689 /mi.
- In-tolerance sizes: 265/45 R20 (+0.3%).
Fitment verdict
265/45 R20 stays within the configured tolerance for 295/40 R20: +0.3% diameter and +0.3% speedometer effect.
| Metric | This size: 295/40 R20 | Alternative: 265/45 R20 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 29.29 in | 29.39 in | +0.3% | Within tolerance |
| Section width | 11.61 in | 10.43 in | -1.18 in | Computed difference |
| Sidewall height | 4.65 in | 4.69 in | +0.05 in | Computed difference |
| Circumference | 92.02 in | 92.33 in | +0.3% | Within tolerance |
| Speedo | 0.0% | +0.3% | +0.3% | Within tolerance |
Seasonal check
Planning a long summer drive?
Use the budget and running-cost tools before a trip, especially if the current tyres are worn or the replacement size changes diameter.
Specification
| Overall diameter | 29.29 in |
|---|---|
| Section width | 11.61 in |
| Sidewall height | 4.65 in |
| Circumference | 92.02 in |
| Revolutions | 428 /km · 689 /mi |
In-tolerance sizes
Alternative sizes that stay within the safe diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 265/45 R20 | +0.3% | +0.3% | ✓ OK |
| 235/55 R19 | -0.4% | -0.4% | ✓ OK |
| 265/50 R19 | +0.5% | +0.5% | ✓ OK |
| 295/35 R21 | -0.6% | -0.6% | ✓ OK |
| 235/60 R18 | -0.6% | -0.6% | ✓ OK |
| 285/45 R19 | -0.7% | -0.7% | ✓ OK |
| 245/70 R16 | +0.7% | +0.7% | ✓ OK |
| 245/65 R17 | +0.8% | +0.8% | ✓ OK |
| 255/55 R18 | -0.8% | -0.8% | ✓ OK |
| 255/50 R19 | -0.9% | -0.9% | ✓ OK |
| 255/45 R20 | -0.9% | -0.9% | ✓ OK |
| 235/65 R17 | -0.9% | -0.9% | ✓ OK |
Compare sizes
- Within tolerance · Diameter +0.3%.
- Speedo @ 60: 60 mph → 60.2 mph.
- Sidewall +0.05 in · Width -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
- 29.29 in 29.39 in+0.10 in
- Sidewall
- 4.65 in 4.69 in+0.05 in
- Width
- 11.61 in 10.43 in-1.18 in
- Circumference
- 92.02 in 92.33 in+0.3%
- Revs / mile
- 689 686
- Speedo @ 60
- 60 mph 60.2 mph+0.3%
- Current —
295/40 R20 - New —
265/45 R20 - Grounded to the road: the axle rises +0.05 in.
Result report
295/40 R20 265/45 R20 · Within tolerance
Use this size when shopping: 265/45 R20
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 175/75R19 | +0.1% | +0.1% | |
OE 295/40R20 | +0.0% | +0.0% | |
+1″ 175/60R21 | -0.1% | -0.1% | |
+2″ 185/50R22 | -0.0% | -0.0% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- 295mm Section width guide
- /40 Aspect ratio guide
- Rim diameter 20"
- Load index chart
- Speed rating chart
- Rim width and tyre fitment guide
- Wheel offset guide
- Wheel spacers guide
- Tyre pressure for heavy loads and towing
What changed
- Reviewed deterministic geometry, load/speed references, sitemap inclusion and localized page shell.