265/75R18 vs 33x12.50R15 tire size comparison
33x12.50R15 is 0.6 in (1.93%) shorter than 265/75R18 and 2.1 in wider. They fit different wheels: 265/75R18 an 18-inch wheel and 33x12.50R15 a 15-inch wheel.
265/75R18 and 33x12.50R15 side by side
| Measurement | 265/75R18 | 33x12.50R15 | Difference | Difference % |
|---|---|---|---|---|
| Section width | 10.4 in (265 mm) | 12.5 in (318 mm) | +2.1 in (+53 mm) | +19.81% |
| Sidewall height | 7.8 in (199 mm) | 9.0 in (229 mm) | +1.2 in (+30 mm) | +15.02% |
| Wheel (rim) diameter | 18.0 in (457 mm) | 15.0 in (381 mm) | -3.0 in (-76 mm) | -16.67% |
| Overall diameter | 33.6 in (855 mm) | 33.0 in (838 mm) | -0.6 in (-17 mm) | -1.93% |
| Circumference | 105.7 in (2685 mm) | 103.7 in (2633 mm) | -2.0 in (-52 mm) | -1.93% |
| Revolutions per mile | 599 | 611 | +12 | +1.97% |
Differences are 33x12.50R15 minus 265/75R18; percentages are relative to 265/75R18. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.
The overall diameter differs by 1.93%, 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 265/75R18, the actual speed on 33x12.50R15 is about 58.8 mph. When it reads 60 mph on a vehicle built for 33x12.50R15, the actual speed on 265/75R18 is about 61.2 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 33x12.50R15 (built for 265/75R18) | Actual on 265/75R18 (built for 33x12.50R15) |
|---|---|---|
| 20 mph | 19.6 mph | 20.4 mph |
| 30 mph | 29.4 mph | 30.6 mph |
| 40 mph | 39.2 mph | 40.8 mph |
| 50 mph | 49.0 mph | 51.0 mph |
| 60 mph | 58.8 mph | 61.2 mph |
| 70 mph | 68.6 mph | 71.4 mph |
| 80 mph | 78.5 mph | 81.6 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.
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 265/75R18 or 33x12.50R15 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.
265/75R18
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Other comparisons with 265/75R18
Side-by-side dimensions and speedometer difference for sizes close to 265/75R18 in overall diameter.
- 265/75R18 vs 275/65R20+1.26% taller than 265/75R18
- 265/75R18 vs LT275/65R20+1.26% taller than 265/75R18
- 265/75R18 vs 275/70R18-1.46% shorter than 265/75R18
- 265/75R18 vs LT275/70R18-1.46% shorter than 265/75R18
- 265/75R18 vs LT315/70R17+2.12% taller than 265/75R18
Other comparisons with 33x12.50R15
Side-by-side dimensions and speedometer difference for sizes close to 33x12.50R15 in overall diameter.
- 275/60R20 vs 33x12.50R15-0.02% shorter than 33x12.50R15
- 285/40R24 vs 33x12.50R15-0.07% shorter than 33x12.50R15
- 275/70R18 vs 33x12.50R15+0.48% taller than 33x12.50R15
- 33x12.50R15 vs LT275/70R18+0.48% taller than 33x12.50R15
- 275/50R22 vs 33x12.50R15-0.52% shorter than 33x12.50R15
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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