285/60 R18
What size is 285/60 R18?
285/60 R18 has an overall diameter of about 31.46 in, a section width of 11.22 in and a sidewall height of 6.73 in. It turns roughly 641 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 31.46 in.
- Section width: 11.22 in.
- Sidewall height: 6.73 in.
- Revolutions: 398 /km · 641 /mi.
- In-tolerance sizes: 265/65 R18 (+0.3%).
Fitment verdict
265/65 R18 stays within the configured tolerance for 285/60 R18: +0.3% diameter and +0.3% speedometer effect.
| Metric | This size: 285/60 R18 | Alternative: 265/65 R18 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 31.46 in | 31.56 in | +0.3% | Within tolerance |
| Section width | 11.22 in | 10.43 in | -0.79 in | Computed difference |
| Sidewall height | 6.73 in | 6.78 in | +0.05 in | Computed difference |
| Circumference | 98.85 in | 99.16 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 | 31.46 in |
|---|---|
| Section width | 11.22 in |
| Sidewall height | 6.73 in |
| Circumference | 98.85 in |
| Revolutions | 398 /km · 641 /mi |
In-tolerance sizes
Alternative sizes that stay within the safe diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 265/65 R18 | +0.3% | +0.3% | ✓ OK |
| 265/70 R17 | +0.5% | +0.5% | ✓ OK |
| 305/40 R22 | +0.5% | +0.5% | ✓ OK |
| 285/50 R20 | -0.8% | -0.8% | ✓ OK |
| 275/45 R22 | +0.9% | +0.9% | ✓ OK |
| 275/55 R20 | +1.4% | +1.4% | ✓ OK |
| 31x10.50 R15 | -1.5% | -1.5% | ✓ OK |
| 31x10.50 R16 | -1.5% | -1.5% | ✓ OK |
| 285/40 R22 | -1.6% | -1.6% | ✓ OK |
| 275/55 R19 | -1.8% | -1.8% | ✓ OK |
| 275/65 R18 | +1.9% | +1.9% | ✓ OK |
| 285/45 R22 | +2.0% | +2.0% | ✓ OK |
Compare sizes
- Within tolerance · Diameter +0.3%.
- Speedo @ 60: 60 mph → 60.2 mph.
- Sidewall +0.05 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
- 31.46 in 31.56 in+0.10 in
- Sidewall
- 6.73 in 6.78 in+0.05 in
- Width
- 11.22 in 10.43 in-0.79 in
- Circumference
- 98.85 in 99.16 in+0.3%
- Revs / mile
- 641 639
- Speedo @ 60
- 60 mph 60.2 mph+0.3%
- Current —
285/60 R18 - New —
265/65 R18 - Grounded to the road: the axle rises +0.05 in.
Result report
285/60 R18 265/65 R18 · Within tolerance
Use this size when shopping: 265/65 R18
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 245/75R17 | +0.0% | +0.0% | |
OE 285/60R18 | +0.0% | +0.0% | |
+1″ 265/60R19 | +0.2% | +0.2% | |
+2″ 265/55R20 | +0.0% | +0.0% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- 285mm Section width guide
- /60 Aspect ratio guide
- Rim diameter 18"
- 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.