LT255/75R17 vs LT275/70R17 tire size comparison
LT275/70R17 is 0.1 in (0.31%) taller than LT255/75R17 and 0.8 in wider.
LT255/75R17 and LT275/70R17 side by side
| Measurement | LT255/75R17 | LT275/70R17 | Difference | Difference % |
|---|---|---|---|---|
| Section width | 10.0 in (255 mm) | 10.8 in (275 mm) | +0.8 in (+20 mm) | +7.84% |
| Sidewall height | 7.5 in (191 mm) | 7.6 in (193 mm) | +0.1 in (+2 mm) | +0.65% |
| Wheel (rim) diameter | 17.0 in (432 mm) | 17.0 in (432 mm) | 0.0 in (0 mm) | 0.00% |
| Overall diameter | 32.1 in (814 mm) | 32.2 in (817 mm) | +0.1 in (+3 mm) | +0.31% |
| Circumference | 100.7 in (2558 mm) | 101.0 in (2566 mm) | +0.3 in (+8 mm) | +0.31% |
| Revolutions per mile | 629 | 627 | -2 | -0.31% |
Differences are LT275/70R17 minus LT255/75R17; percentages are relative to LT255/75R17. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.
The overall diameter differs by 0.31%, 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 LT255/75R17, the actual speed on LT275/70R17 is about 60.2 mph. When it reads 60 mph on a vehicle built for LT275/70R17, the actual speed on LT255/75R17 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 LT275/70R17 (built for LT255/75R17) | Actual on LT255/75R17 (built for LT275/70R17) |
|---|---|---|
| 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 | 70.2 mph | 69.8 mph |
| 80 mph | 80.2 mph | 79.8 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 LT255/75R17 or LT275/70R17 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.
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 LT255/75R17
Side-by-side dimensions and speedometer difference for sizes close to LT255/75R17 in overall diameter.
- 255/70R18 vs LT255/75R17-0.01% shorter than LT255/75R17
- 255/60R20 vs LT255/75R17-0.04% shorter than LT255/75R17
- 275/65R18 vs LT255/75R17+0.05% taller than LT255/75R17
- LT255/75R17 vs LT275/65R18+0.05% taller than LT255/75R17
- 285/45R22 vs LT255/75R17+0.12% taller than LT255/75R17
Other comparisons with LT275/70R17
Side-by-side dimensions and speedometer difference for sizes close to LT275/70R17 in overall diameter.
- 285/45R22 vs LT275/70R17-0.18% shorter than LT275/70R17
- 275/65R18 vs LT275/70R17-0.26% shorter than LT275/70R17
- LT275/65R18 vs LT275/70R17-0.26% shorter than LT275/70R17
- 255/75R17 vs LT275/70R17-0.31% shorter than LT275/70R17
- 255/70R18 vs LT275/70R17-0.32% shorter than LT275/70R17
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.