255/70R17 tire size
255/70R17 is a metric size: 31.1" tall, 10.0" wide, on a 17" rim — about a 31x10.00R17. The sidewall is 7.0" and the tire turns 649 times per mile.
255/70R17 specs
| Overall diameter (height) | 31.06" · 789 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 7.03" · 179 mm (70% of width) |
| Rim diameter | 17" |
| Circumference | 97.56" · 2.478 m |
| Revolutions per mile | 649 (404 per km) |
| Inch (flotation) equivalent | 31x10.00R17 |
Equivalent sizes on a 17" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 265/70R17 common | 31.61" | +1.77% | +10 mm | 61.1 mph | compare → |
| 245/70R17 common | 30.50" | -1.77% | -10 mm | 58.9 mph | compare → |
| 245/65R17 common | 29.54" | -4.88% | -10 mm | 57.1 mph | compare → |
| 245/75R17 common | 31.47" | +1.33% | -10 mm | 60.8 mph | compare → |
| 265/65R17 common | 30.56" | -1.58% | +10 mm | 59.0 mph | compare → |
| 235/80R17 common | 31.80" | +2.41% | -20 mm | 61.4 mph | compare → |
| 255/65R17 common | 30.05" | -3.23% | 0 mm | 58.1 mph | compare → |
| 255/75R17 | 32.06" | +3.23% | 0 mm | 61.9 mph | compare → |
| 235/75R17 | 30.88" | -0.57% | -20 mm | 59.7 mph | compare → |
| 275/70R17 | 32.16" | +3.55% | +20 mm | 62.1 mph | compare → |
| 235/70R17 | 29.95" | -3.55% | -20 mm | 57.9 mph | compare → |
| 225/75R17 | 30.29" | -2.47% | -30 mm | 58.5 mph | compare → |
| 275/60R17 | 29.99" | -3.42% | +20 mm | 57.9 mph | calculate → |
| 275/65R17 | 31.07" | +0.06% | +20 mm | 60.0 mph | calculate → |
| 265/60R17 | 29.52" | -4.94% | +10 mm | 57.0 mph | calculate → |
| 285/65R17 | 31.59" | +1.71% | +30 mm | 61.0 mph | calculate → |
| 31x10.50R17 | 31.00" | -0.18% | +12 mm | 59.9 mph | calculate → |
| 315/55R17 | 30.64" | -1.33% | +60 mm | 59.2 mph | calculate → |
| 315/60R17 | 31.88" | +2.66% | +60 mm | 61.6 mph | calculate → |
| 32x11.50R17 | 32.00" | +3.04% | +37 mm | 61.8 mph | calculate → |
| 285/60R17 | 30.46" | -1.90% | +30 mm | 58.9 mph | calculate → |
| 32x10.50R17 | 32.00" | +3.04% | +12 mm | 61.8 mph | calculate → |
Plus / minus sizing: 16" and 18" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 255/65R18 common | 31.05" | -0.01% | 0 mm | 60.0 mph | compare → |
| 275/60R18 | 30.99" | -0.20% | +20 mm | 59.9 mph | compare → |
| 275/70R16 | 31.16" | +0.33% | +20 mm | 60.2 mph | compare → |
| 235/80R16 | 30.80" | -0.81% | -20 mm | 59.5 mph | calculate → |
| 31x12.50R16 | 31.00" | -0.18% | +63 mm | 59.9 mph | calculate → |
| 31x10.50R16 | 31.00" | -0.18% | +12 mm | 59.9 mph | calculate → |
| 31x11.50R16 | 31.00" | -0.18% | +37 mm | 59.9 mph | calculate → |
| 31x11.00R16 | 31.00" | -0.18% | +24 mm | 59.9 mph | calculate → |
| 235/70R18 | 30.95" | -0.33% | -20 mm | 59.8 mph | calculate → |
| 225/85R16 | 31.06" | +0.01% | -30 mm | 60.0 mph | calculate → |
Try another size against 255/70R17
Questions
What size is 255/70R17 in inches?
255/70R17 is about 31.1" tall and 10.0" wide on a 17-inch rim — roughly a 31x10.00R17 in inch sizing.
What does 255/70R17 mean?
255 mm section width, sidewall 70% of the width (7.03"), radial construction, 17-inch rim.
What tire sizes are equivalent to 255/70R17?
On the same 17" rim, within 3% of the diameter: 275/65R17 (+0.06%), 31x10.50R17 (-0.18%), 235/75R17 (-0.57%), 245/75R17 (+1.33%), 315/55R17 (-1.33%), 265/65R17 (-1.58%).
How many revolutions per mile does a 255/70R17 tire make?
About 649 revolutions per mile (circumference 97.6").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.