275/30R20 vs 315/30R19 tire size comparison
315/30R19 is 0.1 in (0.21%) shorter than 275/30R20 and 1.6 in wider. They fit different wheels: 275/30R20 a 20-inch wheel and 315/30R19 a 19-inch wheel.
275/30R20 and 315/30R19 side by side
| Measurement | 275/30R20 | 315/30R19 | Difference | Difference % |
|---|---|---|---|---|
| Section width | 10.8 in (275 mm) | 12.4 in (315 mm) | +1.6 in (+40 mm) | +14.55% |
| Sidewall height | 3.2 in (83 mm) | 3.7 in (95 mm) | +0.5 in (+12 mm) | +14.55% |
| Wheel (rim) diameter | 20.0 in (508 mm) | 19.0 in (483 mm) | -1.0 in (-25 mm) | -5.00% |
| Overall diameter | 26.5 in (673 mm) | 26.4 in (672 mm) | -0.1 in (-1 mm) | -0.21% |
| Circumference | 83.2 in (2114 mm) | 83.1 in (2110 mm) | -0.1 in (-4 mm) | -0.21% |
| Revolutions per mile | 761 | 763 | +2 | +0.21% |
Differences are 315/30R19 minus 275/30R20; percentages are relative to 275/30R20. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.
The overall diameter differs by 0.21%, which is within the common 3% rule of thumb.
The rule of thumb keeps a replacement size within about 3% of the original overall diameter. It covers diameter only. It is not a fit, load or safety check, because width, wheel diameter, load capacity and clearance matter too. Confirm any size change with your vehicle's owner's manual or a tire professional.
Speedometer difference
When the speedometer reads 60 mph on a vehicle built for 275/30R20, the actual speed on 315/30R19 is about 59.9 mph. When it reads 60 mph on a vehicle built for 315/30R19, the actual speed on 275/30R20 is about 60.1 mph. These figures assume the speedometer is accurate on the original size and use nominal dimensions, so treat them as estimates.
| Speedometer reads | Actual on 315/30R19 (built for 275/30R20) | Actual on 275/30R20 (built for 315/30R19) |
|---|---|---|
| 20 mph | 20.0 mph | 20.0 mph |
| 30 mph | 29.9 mph | 30.1 mph |
| 40 mph | 39.9 mph | 40.1 mph |
| 50 mph | 49.9 mph | 50.1 mph |
| 60 mph | 59.9 mph | 60.1 mph |
| 70 mph | 69.9 mph | 70.1 mph |
| 80 mph | 79.8 mph | 80.2 mph |
A common rule of thumb is to keep a replacement size within about 3% of the original overall diameter. Check the tire placard on the driver's door jamb and your owner's manual for the sizes your vehicle was built for. Confirm any size change with your vehicle's owner's manual or a tire professional.
Which vehicles use each size?
These vehicles list the size among their verified sizes, by trim. Open one to see all of its sizes.
275/30R20
- 2026 Chevrolet Corvette E-Ray(front)
- 2026 Chevrolet Corvette Z06(front)
- 2026 Chevrolet Corvette ZR1(front)
- 2026 Chevrolet Corvette ZR1X(front)
- 2025 Chevrolet Corvette E-Ray 1LZ(front)
- 2025 Chevrolet Corvette E-Ray 1LZ w/ ZER Performance Pkg.(front)
- 2025 Chevrolet Corvette E-Ray 2LZ(front)
- 2025 Chevrolet Corvette E-Ray 2LZ w/ ZER Performance Pkg.(front)
- 2025 Chevrolet Corvette E-Ray 3LZ(front)
- 2025 Chevrolet Corvette E-Ray 3LZ w/ ZER Performance Pkg.(front)
Showing 10 of 18 vehicles. See all on the 275/30R20 page.
Check it in the calculator
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Open this comparison in the calculatorShop for 275/30R20 or 315/30R19 tires
Confirm the size on your tire sidewall or door placard first. These links open each store's own search; prices and stock are on their sites.
275/30R20
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Other comparisons with 275/30R20
Side-by-side dimensions and speedometer difference for sizes close to 275/30R20 in overall diameter.
- 205/65R16 vs 275/30R20-0.01% shorter than 275/30R20
- 215/50R18 vs 275/30R20-0.12% shorter than 275/30R20
- 275/30R20 vs 275/35R19+0.31% taller than 275/30R20
- 235/40R19 vs 275/30R20-0.36% shorter than 275/30R20
- 195/50R19 vs 275/30R20+0.68% taller than 275/30R20
Other comparisons with 315/30R19
Side-by-side dimensions and speedometer difference for sizes close to 315/30R19 in overall diameter.
- 215/50R18 vs 315/30R19+0.09% taller than 315/30R19
- 235/35R20 vs 315/30R19+0.13% taller than 315/30R19
- 205/65R16 vs 315/30R19+0.19% taller than 315/30R19
- 235/45R18 vs 315/30R19-0.43% shorter than 315/30R19
- 245/45R18 vs 315/30R19+0.91% taller than 315/30R19
You might also need
- Digital tire pressure gauge (Amazon search, opens in a new tab)
Check your tire pressure against the number on your door placard.
- Portable tire inflator (Amazon search, opens in a new tab)
Top up a low tire at home without a trip to the gas station.
- Tire tread depth gauge (Amazon search, opens in a new tab)
Measure how much tread is left before you decide to replace.
- Lug wrench or torque wrench (Amazon search, opens in a new tab)
Useful for rotations and tire changes; follow the torque spec in your owner's manual.
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