245/50R19 vs 265/40R20 tire size comparison
265/40R20 is 0.3 in (1.04%) shorter than 245/50R19 and 0.8 in wider. They fit different wheels: 245/50R19 a 19-inch wheel and 265/40R20 a 20-inch wheel.
245/50R19 and 265/40R20 side by side
| Measurement | 245/50R19 | 265/40R20 | Difference | Difference % |
|---|---|---|---|---|
| Section width | 9.6 in (245 mm) | 10.4 in (265 mm) | +0.8 in (+20 mm) | +8.16% |
| Sidewall height | 4.8 in (123 mm) | 4.2 in (106 mm) | -0.6 in (-17 mm) | -13.47% |
| Wheel (rim) diameter | 19.0 in (483 mm) | 20.0 in (508 mm) | +1.0 in (+25 mm) | +5.26% |
| Overall diameter | 28.6 in (728 mm) | 28.3 in (720 mm) | -0.3 in (-8 mm) | -1.04% |
| Circumference | 90.0 in (2286 mm) | 89.1 in (2262 mm) | -0.9 in (-24 mm) | -1.04% |
| Revolutions per mile | 704 | 711 | +7 | +1.06% |
Differences are 265/40R20 minus 245/50R19; percentages are relative to 245/50R19. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.
The overall diameter differs by 1.04%, 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 245/50R19, the actual speed on 265/40R20 is about 59.4 mph. When it reads 60 mph on a vehicle built for 265/40R20, the actual speed on 245/50R19 is about 60.6 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 265/40R20 (built for 245/50R19) | Actual on 245/50R19 (built for 265/40R20) |
|---|---|---|
| 20 mph | 19.8 mph | 20.2 mph |
| 30 mph | 29.7 mph | 30.3 mph |
| 40 mph | 39.6 mph | 40.4 mph |
| 50 mph | 49.5 mph | 50.5 mph |
| 60 mph | 59.4 mph | 60.6 mph |
| 70 mph | 69.3 mph | 70.7 mph |
| 80 mph | 79.2 mph | 80.8 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.
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 245/50R19 or 265/40R20 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.
245/50R19
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Other comparisons with 245/50R19
Side-by-side dimensions and speedometer difference for sizes close to 245/50R19 in overall diameter.
- 245/50R19 vs 275/40R20+0.05% taller than 245/50R19
- 225/60R18 vs 245/50R19-0.05% shorter than 245/50R19
- 245/45R20 vs 245/50R19+0.12% taller than 245/50R19
- 245/50R19 vs 275/35R21-0.23% shorter than 245/50R19
- 225/55R19 vs 245/50R19+0.34% taller than 245/50R19
Other comparisons with 265/40R20
Side-by-side dimensions and speedometer difference for sizes close to 265/40R20 in overall diameter.
- 225/75R15 vs 265/40R20-0.21% shorter than 265/40R20
- 235/50R19 vs 265/40R20-0.33% shorter than 265/40R20
- 225/65R17 vs 265/40R20+0.60% taller than 265/40R20
- 235/55R18 vs 265/40R20-0.60% shorter than 265/40R20
- 265/40R20 vs 295/35R20-0.76% shorter than 265/40R20
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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