35x12.50 R18
What size is 35x12.50 R18?
35x12.50 R18 has an overall diameter of about 35.00 in, a section width of 12.50 in and a sidewall height of 8.50 in. It turns roughly 576 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 35.00 in.
- Section width: 12.50 in.
- Sidewall height: 8.50 in.
- Revolutions: 358 /km · 576 /mi.
- In-tolerance sizes: 35x12.50 R17 (+0.0%).
Fitment verdict
35x12.50 R17 stays within the configured tolerance for 35x12.50 R18: 0.0% diameter and 0.0% speedometer effect.
| Metric | This size: 35x12.50 R18 | Alternative: 35x12.50 R17 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 35.00 in | 35.00 in | 0.0% | Within tolerance |
| Section width | 12.50 in | 12.50 in | 0.00 in | Computed difference |
| Sidewall height | 8.50 in | 9.00 in | +0.50 in | Computed difference |
| Circumference | 109.96 in | 109.96 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 | 35.00 in |
|---|---|
| Section width | 12.50 in |
| Sidewall height | 8.50 in |
| Circumference | 109.96 in |
| Revolutions | 358 /km · 576 /mi |
In-tolerance sizes
Alternative sizes that stay within the safe diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 35x12.50 R17 | +0.0% | +0.0% | ✓ OK |
| 35x12.50 R20 | +0.0% | +0.0% | ✓ OK |
Compare sizes
- Within tolerance · Diameter +0.0%.
- Speedo @ 60: 60 mph → 60.0 mph.
- Sidewall +0.50 in · Width +0.00 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
- 35.00 in 35.00 in+0.00 in
- Sidewall
- 8.50 in 9.00 in+0.50 in
- Width
- 12.50 in 12.50 in+0.00 in
- Circumference
- 109.96 in 109.96 in+0.0%
- Revs / mile
- 576 576
- Speedo @ 60
- 60 mph 60.0 mph+0.0%
- Current —
35x12.50 R18 - New —
35x12.50 R17 - Grounded to the road: the axle rises +0.00 in.
Result report
35x12.50 R18 35x12.50 R17 · Within tolerance
Use this size when shopping: 35x12.50 R17
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 305/75R17 | +0.0% | +0.0% | |
OE 335/65R18 | +0.4% | +0.4% | |
+1″ 255/80R19 | +0.2% | +0.2% | |
+2″ 255/75R20 | +0.2% | +0.2% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- Section width guide
- 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.