235/40R18 vs 245/35R19 tire size comparison
245/35R19 is 0.4 in (1.38%) taller than 235/40R18 and 0.3 in wider. They fit different wheels: 235/40R18 an 18-inch wheel and 245/35R19 a 19-inch wheel.
235/40R18 and 245/35R19 side by side
| Measurement | 235/40R18 | 245/35R19 | Difference | Difference % |
|---|---|---|---|---|
| Section width | 9.3 in (235 mm) | 9.6 in (245 mm) | +0.3 in (+10 mm) | +4.26% |
| Sidewall height | 3.7 in (94 mm) | 3.4 in (86 mm) | -0.3 in (-8 mm) | -8.78% |
| Wheel (rim) diameter | 18.0 in (457 mm) | 19.0 in (483 mm) | +1.0 in (+26 mm) | +5.56% |
| Overall diameter | 25.4 in (645 mm) | 25.8 in (654 mm) | +0.4 in (+9 mm) | +1.38% |
| Circumference | 79.8 in (2027 mm) | 80.9 in (2055 mm) | +1.1 in (+28 mm) | +1.38% |
| Revolutions per mile | 794 | 783 | -11 | -1.36% |
Differences are 245/35R19 minus 235/40R18; percentages are relative to 235/40R18. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.
The overall diameter differs by 1.38%, 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 235/40R18, the actual speed on 245/35R19 is about 60.8 mph. When it reads 60 mph on a vehicle built for 245/35R19, the actual speed on 235/40R18 is about 59.2 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 245/35R19 (built for 235/40R18) | Actual on 235/40R18 (built for 245/35R19) |
|---|---|---|
| 20 mph | 20.3 mph | 19.7 mph |
| 30 mph | 30.4 mph | 29.6 mph |
| 40 mph | 40.6 mph | 39.5 mph |
| 50 mph | 50.7 mph | 49.3 mph |
| 60 mph | 60.8 mph | 59.2 mph |
| 70 mph | 71.0 mph | 69.0 mph |
| 80 mph | 81.1 mph | 78.9 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.
235/40R18
- 2026 Acura Integra A-Spec
- 2026 Acura Integra A-Spec with Technology Package (6MT)
- 2026 Acura Integra A-Spec with Technology Package (CVT)
- 2025 Acura Integra A-Spec
- 2025 Acura Integra A-Spec with Technology Package (6MT)
- 2025 Acura Integra A-Spec with Technology Package (CVT)
- 2024 Acura Integra A-Spec Package · In-Line 4 Cylinder with Turbocharger
- 2024 Acura Integra A-Spec with Technology Package (6MT) · In-Line 4 Cylinder with Turbocharger
- 2024 Acura Integra A-Spec with Technology Package (CVT) · In-Line 4 Cylinder with Turbocharger
- 2023 Acura Integra A-Spec Package · In-Line 4 Cylinder with Turbocharger
Showing 10 of 84 vehicles. See all on the 235/40R18 page.
245/35R19
- 2022 Acura NSX Type S(front)
- 2021 Acura NSX NSX(front)
- 2020 Acura NSX NSX(front)
- 2026 Chevrolet Corvette Stingray(front)
- 2025 Chevrolet Corvette Stingray 1LT(front)
- 2025 Chevrolet Corvette Stingray 1LT w/ Z51 Performance Pkg.(front)
- 2025 Chevrolet Corvette Stingray 2LT(front)
- 2025 Chevrolet Corvette Stingray 2LT w/ Z51 Performance Pkg.(front)
- 2025 Chevrolet Corvette Stingray 3LT(front)
- 2025 Chevrolet Corvette Stingray 3LT w/ Z51 Performance Pkg.(front)
Showing 10 of 22 vehicles. See all on the 245/35R19 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 235/40R18 or 245/35R19 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.
235/40R18
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Other comparisons with 235/40R18
Side-by-side dimensions and speedometer difference for sizes close to 235/40R18 in overall diameter.
- 215/50R17 vs 235/40R18+0.25% taller than 235/40R18
- 235/35R19 vs 235/40R18+0.29% taller than 235/40R18
- 235/40R18 vs 235/45R17-0.29% shorter than 235/40R18
- 205/65R15 vs 235/40R18+0.36% taller than 235/40R18
- 215/55R16 vs 235/40R18-0.36% shorter than 235/40R18
Other comparisons with 245/35R19
Side-by-side dimensions and speedometer difference for sizes close to 245/35R19 in overall diameter.
- 245/30R20 vs 245/35R19+0.14% taller than 245/35R19
- 245/35R19 vs 245/40R18-0.14% shorter than 245/35R19
- 205/60R16 vs 245/35R19-0.26% shorter than 245/35R19
- 225/50R17 vs 245/35R19+0.41% taller than 245/35R19
- 205/55R17 vs 245/35R19+0.49% taller than 245/35R19
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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