225/55 R17
What size is 225/55 R17?
225/55 R17 has an overall diameter of about 26.74 in, a section width of 8.86 in and a sidewall height of 4.87 in. It turns roughly 754 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 26.74 in.
- Section width: 8.86 in.
- Sidewall height: 4.87 in.
- Revolutions: 469 /km · 754 /mi.
- In-tolerance sizes: 245/35 R20 (+0.0%).
Fitment verdict
245/35 R20 stays within the configured tolerance for 225/55 R17: 0.0% diameter and 0.0% speedometer effect.
| Metric | This size: 225/55 R17 | Alternative: 245/35 R20 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 26.74 in | 26.75 in | 0.0% | Within tolerance |
| Section width | 8.86 in | 9.65 in | +0.79 in | Computed difference |
| Sidewall height | 4.87 in | 3.38 in | -1.50 in | Computed difference |
| Circumference | 84.02 in | 84.04 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 | 26.74 in |
|---|---|
| Section width | 8.86 in |
| Sidewall height | 4.87 in |
| Circumference | 84.02 in |
| Revolutions | 469 /km · 754 /mi |
In-tolerance sizes
Alternative sizes that stay within the safe diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 245/35 R20 | +0.0% | +0.0% | ✓ OK |
| 245/40 R19 | -0.1% | -0.1% | ✓ OK |
| 245/45 R18 | -0.2% | -0.2% | ✓ OK |
| 215/70 R15 | +0.4% | +0.4% | ✓ OK |
| 225/60 R16 | -0.4% | -0.4% | ✓ OK |
| 215/65 R16 | +1.0% | +1.0% | ✓ OK |
| 255/35 R20 | +1.1% | +1.1% | ✓ OK |
| 255/40 R19 | +1.1% | +1.1% | ✓ OK |
| 255/45 R18 | +1.1% | +1.1% | ✓ OK |
| 235/60 R16 | +1.3% | +1.3% | ✓ OK |
| 215/60 R17 | +1.5% | +1.5% | ✓ OK |
| 235/45 R18 | -1.6% | -1.6% | ✓ 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
- 26.74 in 26.75 in+0.01 in
- Sidewall
- 4.87 in 3.38 in-1.50 in
- Width
- 8.86 in 9.65 in+0.79 in
- Circumference
- 84.02 in 84.04 in+0.0%
- Revs / mile
- 754 754
- Speedo @ 60
- 60 mph 60.0 mph+0.0%
- Current —
225/55 R17 - New —
245/35 R20 - Grounded to the road: the axle rises +0.00 in.
Result report
225/55 R17 245/35 R20 · Within tolerance
Use this size when shopping: 245/35 R20
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 195/70R16 | +0.0% | +0.0% | |
OE 225/55R17 | +0.0% | +0.0% | |
+1″ 185/60R18 | -0.0% | -0.0% | |
+2″ 245/40R19 | -0.1% | -0.1% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- 225mm Section width guide
- /55 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.