255/85R17 tire size
255/85R17 is a metric size: 34.1" tall, 10.0" wide, on a 17" rim — about a 34x10.00R17. The sidewall is 8.5" and the tire turns 592 times per mile.
255/85R17 specs
| Overall diameter (height) | 34.07" · 865 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 8.53" · 217 mm (85% of width) |
| Rim diameter | 17" |
| Circumference | 107.02" · 2.718 m |
| Revolutions per mile | 592 (368 per km) |
| Inch (flotation) equivalent | 34x10.00R17 |
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 | |
|---|---|---|---|---|---|
| 285/70R17 common | 32.71" | -3.99% | +30 mm | 57.6 mph | calculate → |
| 35x12.50R17 common | 35.00" | +2.74% | +63 mm | 61.6 mph | calculate → |
| 315/70R17 common | 34.36" | +0.87% | +60 mm | 60.5 mph | calculate → |
| 295/70R17 | 33.26" | -2.37% | +40 mm | 58.6 mph | calculate → |
| 285/75R17 | 33.83" | -0.69% | +30 mm | 59.6 mph | calculate → |
| 33x12.50R17 | 33.00" | -3.13% | +63 mm | 58.1 mph | calculate → |
| 255/80R17 | 33.06" | -2.95% | 0 mm | 58.2 mph | calculate → |
| 305/70R17 | 33.81" | -0.75% | +50 mm | 59.5 mph | calculate → |
| 305/65R17 | 32.61" | -4.28% | +50 mm | 57.4 mph | calculate → |
| 35x11.50R17 | 35.00" | +2.74% | +37 mm | 61.6 mph | calculate → |
| 34x10.50R17 | 34.00" | -0.20% | +12 mm | 59.9 mph | calculate → |
| 35x14.50R17 | 35.00" | +2.74% | +113 mm | 61.6 mph | calculate → |
| 35x13.50R17 | 35.00" | +2.74% | +88 mm | 61.6 mph | calculate → |
| 275/80R17 | 34.32" | +0.75% | +20 mm | 60.5 mph | calculate → |
| 35x10.50R17 | 35.00" | +2.74% | +12 mm | 61.6 mph | calculate → |
| 33x10.50R17 | 33.00" | -3.13% | +12 mm | 58.1 mph | calculate → |
| 33x11.50R17 | 33.00" | -3.13% | +37 mm | 58.1 mph | calculate → |
| 33x13.50R17 | 33.00" | -3.13% | +88 mm | 58.1 mph | calculate → |
| 33x13.00R17 | 33.00" | -3.13% | +75 mm | 58.1 mph | calculate → |
| 33x9.50R17 | 33.00" | -3.13% | -14 mm | 58.1 mph | calculate → |
| 325/70R17 | 34.91" | +2.48% | +70 mm | 61.5 mph | calculate → |
| 235/85R17 | 32.73" | -3.93% | -20 mm | 57.6 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 | |
|---|---|---|---|---|---|
| 295/70R18 common | 34.26" | +0.57% | +40 mm | 60.3 mph | calculate → |
| 34x10.50R16 | 34.00" | -0.20% | +12 mm | 59.9 mph | calculate → |
| 34x12.50R16 | 34.00" | -0.20% | +63 mm | 59.9 mph | calculate → |
| 34x12.50R18 | 34.00" | -0.20% | +63 mm | 59.9 mph | calculate → |
| 34x13.50R16 | 34.00" | -0.20% | +88 mm | 59.9 mph | calculate → |
| 34x9.00R16 | 34.00" | -0.20% | -26 mm | 59.9 mph | calculate → |
Try another size against 255/85R17
Questions
What size is 255/85R17 in inches?
255/85R17 is about 34.1" tall and 10.0" wide on a 17-inch rim — roughly a 34x10.00R17 in inch sizing.
What does 255/85R17 mean?
255 mm section width, sidewall 85% of the width (8.53"), radial construction, 17-inch rim.
What tire sizes are equivalent to 255/85R17?
On the same 17" rim, within 3% of the diameter: 34x10.50R17 (-0.20%), 285/75R17 (-0.69%), 275/80R17 (+0.75%), 305/70R17 (-0.75%), 315/70R17 (+0.87%), 295/70R17 (-2.37%).
How many revolutions per mile does a 255/85R17 tire make?
About 592 revolutions per mile (circumference 107.0").
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.