225/40R19 vs 305/30R19 tire size comparison
305/30R19 is 0.1 in (0.45%) taller than 225/40R19 and 3.1 in wider.
225/40R19 and 305/30R19 side by side
| Measurement | 225/40R19 | 305/30R19 | Difference | Difference % |
|---|---|---|---|---|
| Section width | 8.9 in (225 mm) | 12.0 in (305 mm) | +3.1 in (+80 mm) | +35.56% |
| Sidewall height | 3.5 in (90 mm) | 3.6 in (92 mm) | +0.1 in (+2 mm) | +1.67% |
| Wheel (rim) diameter | 19.0 in (483 mm) | 19.0 in (483 mm) | 0.0 in (0 mm) | 0.00% |
| Overall diameter | 26.1 in (663 mm) | 26.2 in (666 mm) | +0.1 in (+3 mm) | +0.45% |
| Circumference | 82.0 in (2082 mm) | 82.3 in (2091 mm) | +0.3 in (+9 mm) | +0.45% |
| Revolutions per mile | 773 | 770 | -3 | -0.45% |
Differences are 305/30R19 minus 225/40R19; percentages are relative to 225/40R19. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.
The overall diameter differs by 0.45%, 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 225/40R19, the actual speed on 305/30R19 is about 60.3 mph. When it reads 60 mph on a vehicle built for 305/30R19, the actual speed on 225/40R19 is about 59.7 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 305/30R19 (built for 225/40R19) | Actual on 225/40R19 (built for 305/30R19) |
|---|---|---|
| 20 mph | 20.1 mph | 19.9 mph |
| 30 mph | 30.1 mph | 29.9 mph |
| 40 mph | 40.2 mph | 39.8 mph |
| 50 mph | 50.2 mph | 49.8 mph |
| 60 mph | 60.3 mph | 59.7 mph |
| 70 mph | 70.3 mph | 69.7 mph |
| 80 mph | 80.4 mph | 79.6 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.
225/40R19
- 2026 BMW 3 Series M340i xDrive 50 Jahre Edition
- 2025 BMW 3 Series M340i
- 2025 BMW 3 Series M340i xDrive
- 2021 BMW 3 Series 330e(front)
- 2021 BMW 3 Series 330e xDrive(front)
- 2026 Genesis G70 2.5T(front)
- 2026 Genesis G70 2.5T Prestige(front)
- 2026 Genesis G70 3.3T Sport Prestige(front)
- 2025 Genesis G70 2.5T(front)
- 2025 Genesis G70 3.3T(front)
Showing 10 of 11 vehicles. See all on the 225/40R19 page.
305/30R19
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 225/40R19 or 305/30R19 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.
225/40R19
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Other comparisons with 225/40R19
Side-by-side dimensions and speedometer difference for sizes close to 225/40R19 in overall diameter.
- 215/60R16 vs 225/40R19+0.27% taller than 225/40R19
- 225/40R19 vs 225/45R18-0.44% shorter than 225/40R19
- 195/60R17 vs 225/40R19+0.48% taller than 225/40R19
- 205/55R17 vs 225/40R19-0.80% shorter than 225/40R19
- 225/40R19 vs 235/45R18+0.92% taller than 225/40R19
Other comparisons with 305/30R19
Side-by-side dimensions and speedometer difference for sizes close to 305/30R19 in overall diameter.
- 195/60R17 vs 305/30R19+0.03% taller than 305/30R19
- 215/60R16 vs 305/30R19-0.18% shorter than 305/30R19
- 205/70R15 vs 305/30R19+0.36% taller than 305/30R19
- 215/55R17 vs 305/30R19+0.41% taller than 305/30R19
- 235/45R18 vs 305/30R19+0.47% taller than 305/30R19
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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