Home › 17" tire sizes › 255/70R17
255/70R17 tire size in inches
255/70R17 is 31.06" tall and 10.04" wide, and fits a 17" rim. In flotation (inch) sizing that is roughly 31.1x10.0R17.
255/70R17 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 31.06" | 789 mm |
| Section width | 10.04" | 255 mm |
| Sidewall height | 7.03" | 178.5 mm |
| Rim diameter | 17" | 431.8 mm |
| Circumference | 97.6" | 2478 mm |
| Revolutions per mile | 649 | |
| Aspect ratio | 70% (sidewall is 70% of the width) | |
Drawn to scale
Among the 124 sizes for 17" wheels on this site, 255/70R17 is #68 by height (shortest: 205/40R17, tallest: 385/70R17).
What people compare 255/70R17 with
Real comparisons drivers search for, worked out against 255/70R17:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 265/70R17 | +0.55" (+1.77%) | +0.39" | +0.27" | 59 mph |
| 285/70R17 | +1.65" (+5.31%) | +1.18" | +0.82" | 57 mph |
| 255/75R17 | +1.00" (+3.22%) | 0.00" | +0.50" | 58.1 mph |
| 265/65R17 | -0.50" (-1.61%) | +0.39" | -0.25" | 61 mph |
| 245/70R17 | -0.56" (-1.8%) | -0.39" | -0.28" | 61.1 mph |
| 275/70R17 | +1.10" (+3.54%) | +0.79" | +0.55" | 57.9 mph |
| 245/75R17 | +0.41" (+1.32%) | -0.39" | +0.20" | 59.2 mph |
| 255/65R17 | -1.01" (-3.25%) | 0.00" | -0.50" | 62 mph |
How the 255/70R17 numbers are worked out
The size code reads as 255 mm section width, 70% aspect ratio, R for radial construction and 17-inch wheel.
- Sidewall = 255 × 70% = 178.5 mm = 7.03"
- Diameter = 17" + 2 × 7.03" = 31.06"
- Circumference = π × 31.06" = 97.6"
- Revs per mile = 63,360" ÷ 97.6" = 649
Sizes that can replace 255/70R17 on a 17" wheel
Within 3% of 31.06". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 275/65R17 | 31.07" | 10.83" | +0.03% | 60 mph |
| 295/60R17 | 30.94" | 11.61" | -0.39% | 60.2 mph |
| 235/75R17 | 30.88" | 9.25" | -0.58% | 60.3 mph |
| 270/65R17 | 30.82" | 10.63" | -0.77% | 60.5 mph |
| 260/70R17 | 31.33" | 10.24" | +0.87% | 59.5 mph |
| 305/60R17 | 31.41" | 12.01" | +1.13% | 59.3 mph |
| 245/75R17 | 31.47" | 9.65" | +1.32% | 59.2 mph |
| 315/55R17 | 30.64" | 12.40" | -1.35% | 60.8 mph |
| 265/65R17 | 30.56" | 10.43" | -1.61% | 61 mph |
| 285/65R17 | 31.59" | 11.22" | +1.71% | 59 mph |
| 265/70R17 | 31.61" | 10.43" | +1.77% | 59 mph |
| 245/70R17 | 30.50" | 9.65" | -1.8% | 61.1 mph |
One size wider or narrower
Same height on a different wheel size
- 255/80R15 15" (0%)
- 275/75R15 15" (+0.58%)
- 295/70R15 15" (+0.64%)
- 235/85R15 15" (-1.06%)
- 245/85R15 15" (+1.09%)
- 285/70R15 15" (-1.13%)
- 265/75R15 15" (-1.32%)
- 255/75R16 16" (0%)
- 225/85R16 16" (0%)
- 275/70R16 16" (+0.32%)
Questions about 255/70R17
How tall is a 255/70R17 tire in inches?
A 255/70R17 tire is 31.06 inches (789 mm) tall: the 17-inch rim plus two sidewalls of 7.03 inches each.
Is 255/70R17 a 31 inch tire?
Yes. At 31.06 inches tall it is commonly called a 31-inch tire.
How many revolutions per mile does a 255/70R17 make?
About 649 revolutions per mile, based on a calculated circumference of 97.6 inches.
What size can replace 255/70R17?
275/65R17 is the closest match on a 17" rim (+0.03% height). Check load index, speed rating and clearance first.
Compare 255/70R17 against any other size with the tire size calculator.