235/65 R17
What size is 235/65 R17?
235/65 R17 has an overall diameter of about 29.03 in, a section width of 9.25 in and a sidewall height of 6.01 in. It turns roughly 695 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 29.03 in.
- Section width: 9.25 in.
- Sidewall height: 6.01 in.
- Revolutions: 432 /km · 695 /mi.
- In-tolerance sizes: 255/45 R20 (+0.0%).
Fitment verdict
255/45 R20 stays within the configured tolerance for 235/65 R17: 0.0% diameter and 0.0% speedometer effect.
| Metric | This size: 235/65 R17 | Alternative: 255/45 R20 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 29.03 in | 29.04 in | 0.0% | Within tolerance |
| Section width | 9.25 in | 10.04 in | +0.79 in | Computed difference |
| Sidewall height | 6.01 in | 4.52 in | -1.50 in | Computed difference |
| Circumference | 91.19 in | 91.22 in | 0.0% | Within tolerance |
| Speedo | 0.0% | 0.0% | 0.0% | 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 | 29.03 in |
|---|---|
| Section width | 9.25 in |
| Sidewall height | 6.01 in |
| Circumference | 91.19 in |
| Revolutions | 432 /km · 695 /mi |
In-tolerance sizes
Alternative sizes that stay within the safe diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 255/45 R20 | +0.0% | +0.0% | ✓ OK |
| 255/50 R19 | +0.0% | +0.0% | ✓ OK |
| 255/55 R18 | +0.1% | +0.1% | ✓ OK |
| 285/45 R19 | +0.2% | +0.2% | ✓ OK |
| 235/60 R18 | +0.3% | +0.3% | ✓ OK |
| 295/35 R21 | +0.4% | +0.4% | ✓ OK |
| 235/55 R19 | +0.5% | +0.5% | ✓ OK |
| 295/40 R20 | +0.9% | +0.9% | ✓ OK |
| 275/45 R19 | -1.0% | -1.0% | ✓ OK |
| 245/45 R20 | -1.2% | -1.2% | ✓ OK |
| 265/45 R20 | +1.2% | +1.2% | ✓ OK |
| 275/40 R20 | -1.3% | -1.3% | ✓ OK |
Compare sizes
- Within tolerance · Diameter +0.0%.
- Speedo @ 60: 60 mph → 60.0 mph.
- Sidewall -1.50 in · Width +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
- 29.03 in 29.04 in+0.01 in
- Sidewall
- 6.01 in 4.52 in-1.50 in
- Width
- 9.25 in 10.04 in+0.79 in
- Circumference
- 91.19 in 91.22 in+0.0%
- Revs / mile
- 695 695
- Speedo @ 60
- 60 mph 60.0 mph+0.0%
- Current —
235/65 R17 - New —
255/45 R20 - Grounded to the road: the axle rises +0.00 in.
Result report
235/65 R17 255/45 R20 · Within tolerance
Use this size when shopping: 255/45 R20
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 255/65R16 | +0.1% | +0.1% | |
OE 235/65R17 | +0.0% | +0.0% | |
+1″ 175/80R18 | -0.0% | -0.0% | |
+2″ 255/50R19 | +0.0% | +0.0% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- 235mm Section width guide
- /65 Aspect ratio guide
- Rim diameter 17"
- 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.