235/40R19 vs 275/30R20 tire size comparison
275/30R20 is 0.1 in (0.36%) taller than 235/40R19 and 1.5 in wider. They fit different wheels: 235/40R19 a 19-inch wheel and 275/30R20 a 20-inch wheel.
235/40R19 and 275/30R20 side by side
| Measurement | 235/40R19 | 275/30R20 | Difference | Difference % |
|---|---|---|---|---|
| Section width | 9.3 in (235 mm) | 10.8 in (275 mm) | +1.5 in (+40 mm) | +17.02% |
| Sidewall height | 3.7 in (94 mm) | 3.2 in (83 mm) | -0.5 in (-11 mm) | -12.23% |
| Wheel (rim) diameter | 19.0 in (483 mm) | 20.0 in (508 mm) | +1.0 in (+25 mm) | +5.26% |
| Overall diameter | 26.4 in (671 mm) | 26.5 in (673 mm) | +0.1 in (+2 mm) | +0.36% |
| Circumference | 82.9 in (2107 mm) | 83.2 in (2114 mm) | +0.3 in (+7 mm) | +0.36% |
| Revolutions per mile | 764 | 761 | -3 | -0.36% |
Differences are 275/30R20 minus 235/40R19; percentages are relative to 235/40R19. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.
The overall diameter differs by 0.36%, 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 235/40R19, the actual speed on 275/30R20 is about 60.2 mph. When it reads 60 mph on a vehicle built for 275/30R20, the actual speed on 235/40R19 is about 59.8 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 275/30R20 (built for 235/40R19) | Actual on 235/40R19 (built for 275/30R20) |
|---|---|---|
| 20 mph | 20.1 mph | 19.9 mph |
| 30 mph | 30.1 mph | 29.9 mph |
| 40 mph | 40.1 mph | 39.9 mph |
| 50 mph | 50.2 mph | 49.8 mph |
| 60 mph | 60.2 mph | 59.8 mph |
| 70 mph | 70.3 mph | 69.8 mph |
| 80 mph | 80.3 mph | 79.7 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.
235/40R19
- 2026 Honda Accord SE
- 2026 Honda Accord Sport Hybrid
- 2026 Honda Accord Sport-L Hybrid
- 2026 Honda Accord Touring Hybrid
- 2025 Honda Accord Sport · Atkinson In-Line 4-cylinder (hybrid)
- 2025 Honda Accord Sport-L · Atkinson In-Line 4-cylinder (hybrid)
- 2025 Honda Accord Touring · Atkinson In-Line 4-cylinder (hybrid)
- 2024 Honda Accord Sport · 2.0L DI Atkinson (two-motor hybrid)
- 2024 Honda Accord Sport-L · 2.0L DI Atkinson (two-motor hybrid)
- 2024 Honda Accord Touring · 2.0L DI Atkinson (two-motor hybrid)
Showing 10 of 82 vehicles. See all on the 235/40R19 page.
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
The calculator takes the same two sizes and shows the full comparison, or lets you swap either one for another size.
Open this comparison in the calculatorShop for 235/40R19 or 275/30R20 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.
235/40R19
We may earn a commission if you buy through these links. It doesn't change the price you pay. Read our affiliate disclosure.
Other comparisons with 235/40R19
Side-by-side dimensions and speedometer difference for sizes close to 235/40R19 in overall diameter.
- 215/50R18 vs 235/40R19+0.24% taller than 235/40R19
- 235/35R20 vs 235/40R19+0.28% taller than 235/40R19
- 235/40R19 vs 235/45R18-0.28% shorter than 235/40R19
- 205/65R16 vs 235/40R19+0.34% taller than 235/40R19
- 215/55R17 vs 235/40R19-0.34% shorter than 235/40R19
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 315/30R19-0.21% shorter than 275/30R20
- 275/30R20 vs 275/35R19+0.31% taller than 275/30R20
- 195/50R19 vs 275/30R20+0.68% taller than 275/30R20
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.
Paid links to Amazon search results. As an Amazon Associate I earn from qualifying purchases. Read our affiliate disclosure.