245/45 R17
What size is 245/45 R17?
245/45 R17 has an overall diameter of about 25.68 in, a section width of 9.65 in and a sidewall height of 4.34 in. It turns roughly 785 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 25.68 in.
- Section width: 9.65 in.
- Sidewall height: 4.34 in.
- Revolutions: 488 /km · 785 /mi.
- In-tolerance sizes: 205/60 R16 (+0.0%).
Fitment verdict
205/60 R16 stays within the configured tolerance for 245/45 R17: 0.0% diameter and 0.0% speedometer effect.
| Metric | This size: 245/45 R17 | Alternative: 205/60 R16 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 25.68 in | 25.69 in | 0.0% | Within tolerance |
| Section width | 9.65 in | 8.07 in | -1.57 in | Computed difference |
| Sidewall height | 4.34 in | 4.84 in | +0.50 in | Computed difference |
| Circumference | 80.68 in | 80.69 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 | 25.68 in |
|---|---|
| Section width | 9.65 in |
| Sidewall height | 4.34 in |
| Circumference | 80.68 in |
| Revolutions | 488 /km · 785 /mi |
In-tolerance sizes
Alternative sizes that stay within the safe diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 205/60 R16 | +0.0% | +0.0% | ✓ OK |
| 245/40 R18 | +0.1% | +0.1% | ✓ OK |
| 225/55 R16 | +0.2% | +0.2% | ✓ OK |
| 245/35 R19 | +0.3% | +0.3% | ✓ OK |
| 225/50 R17 | +0.7% | +0.7% | ✓ OK |
| 205/65 R15 | -0.7% | -0.7% | ✓ OK |
| 205/55 R17 | +0.8% | +0.8% | ✓ OK |
| 235/35 R19 | -0.8% | -0.8% | ✓ OK |
| 215/50 R17 | -0.8% | -0.8% | ✓ OK |
| 235/40 R18 | -1.1% | -1.1% | ✓ OK |
| 225/45 R18 | +1.1% | +1.1% | ✓ OK |
| 255/35 R19 | +1.3% | +1.3% | ✓ OK |
Compare sizes
- Within tolerance · Diameter +0.0%.
- Speedo @ 60: 60 mph → 60.0 mph.
- Sidewall +0.50 in · Width -1.57 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
- 25.68 in 25.69 in+0.00 in
- Sidewall
- 4.34 in 4.84 in+0.50 in
- Width
- 9.65 in 8.07 in-1.57 in
- Circumference
- 80.68 in 80.69 in+0.0%
- Revs / mile
- 785 785
- Speedo @ 60
- 60 mph 60.0 mph+0.0%
- Current —
245/45 R17 - New —
205/60 R16 - Grounded to the road: the axle rises +0.00 in.
Result report
245/45 R17 205/60 R16 · Within tolerance
Use this size when shopping: 205/60 R16
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 205/60R16 | +0.0% | +0.0% | |
OE 245/45R17 | +0.0% | +0.0% | |
+1″ 195/50R18 | -0.0% | -0.0% | |
+2″ 155/55R19 | +0.1% | +0.1% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- 245mm Section width guide
- /45 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.