275/45 R19
What size is 275/45 R19?
275/45 R19 has an overall diameter of about 28.74 in, a section width of 10.83 in and a sidewall height of 4.87 in. It turns roughly 702 times per mile. Below are the exact figures plus in-tolerance plus/minus sizes you can switch to safely.
- Overall diameter: 28.74 in.
- Section width: 10.83 in.
- Sidewall height: 4.87 in.
- Revolutions: 436 /km · 702 /mi.
- In-tolerance sizes: 245/45 R20 (-0.2%).
Fitment verdict
245/45 R20 stays within the configured tolerance for 275/45 R19: -0.2% diameter and -0.2% speedometer effect.
| Metric | This size: 275/45 R19 | Alternative: 245/45 R20 | Difference | Verdict |
|---|---|---|---|---|
| Overall diameter | 28.74 in | 28.68 in | -0.2% | Within tolerance |
| Section width | 10.83 in | 9.65 in | -1.18 in | Computed difference |
| Sidewall height | 4.87 in | 4.34 in | -0.53 in | Computed difference |
| Circumference | 90.30 in | 90.10 in | -0.2% | Within tolerance |
| Speedo | 0.0% | -0.2% | -0.2% | 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 | 28.74 in |
|---|---|
| Section width | 10.83 in |
| Sidewall height | 4.87 in |
| Circumference | 90.30 in |
| Revolutions | 436 /km · 702 /mi |
In-tolerance sizes
Alternative sizes that stay within the safe diameter tolerance:
| Size | Diameter | Speedo | Verdict |
|---|---|---|---|
| 245/45 R20 | -0.2% | -0.2% | ✓ OK |
| 275/40 R20 | -0.3% | -0.3% | ✓ OK |
| 225/65 R17 | -0.8% | -0.8% | ✓ OK |
| 235/65 R17 | +1.0% | +1.0% | ✓ OK |
| 255/45 R20 | +1.0% | +1.0% | ✓ OK |
| 255/50 R19 | +1.0% | +1.0% | ✓ OK |
| 255/55 R18 | +1.0% | +1.0% | ✓ OK |
| 285/45 R19 | +1.2% | +1.2% | ✓ OK |
| 235/60 R18 | +1.2% | +1.2% | ✓ OK |
| 295/35 R21 | +1.3% | +1.3% | ✓ OK |
| 235/55 R19 | +1.5% | +1.5% | ✓ OK |
| 235/50 R19 | -1.7% | -1.7% | ✓ OK |
Compare sizes
- Within tolerance · Diameter -0.2%.
- Speedo @ 60: 60 mph → 59.9 mph.
- Sidewall -0.53 in · Width -1.18 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
- 28.74 in 28.68 in-0.06 in
- Sidewall
- 4.87 in 4.34 in-0.53 in
- Width
- 10.83 in 9.65 in-1.18 in
- Circumference
- 90.30 in 90.10 in-0.2%
- Revs / mile
- 702 703
- Speedo @ 60
- 60 mph 59.9 mph-0.2%
- Current —
275/45 R19 - New —
245/45 R20 - Grounded to the road: the axle rises -0.03 in.
Result report
275/45 R19 245/45 R20 · Within tolerance
Use this size when shopping: 245/45 R20
Geometric estimate. Always verify physical clearance (arches, suspension, brakes) before fitting.
Safe alternative sizes
| Size | Diameter | Speedo @ 100 | Use this |
|---|---|---|---|
−1″ 195/70R18 | +0.0% | +0.0% | |
OE 275/45R19 | +0.0% | +0.0% | |
+1″ 185/60R20 | -0.0% | -0.0% | |
+2″ 245/40R21 | -0.1% | -0.1% |
More tools
- How to read a tire size
- Plus sizing guide
- Speedometer error guide
- 275mm Section width guide
- /45 Aspect ratio guide
- Rim diameter 19"
- 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.