Home › 17" tire sizes › 255/85R17
255/85R17 tire size in inches
255/85R17 is 34.07" tall and 10.04" wide, and fits a 17" rim. In flotation (inch) sizing that is roughly 34.1x10.0R17.
255/85R17 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 34.07" | 865 mm |
| Section width | 10.04" | 255 mm |
| Sidewall height | 8.53" | 216.8 mm |
| Rim diameter | 17" | 431.8 mm |
| Circumference | 107.0" | 2718 mm |
| Revolutions per mile | 592 | |
| Aspect ratio | 85% (sidewall is 85% of the width) | |
Drawn to scale
Among the 124 sizes for 17" wheels on this site, 255/85R17 is #100 by height (shortest: 205/40R17, tallest: 385/70R17).
What people compare 255/85R17 with
Real comparisons drivers search for, worked out against 255/85R17:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 285/70R17 | -1.36" (-3.99%) | +1.18" | -0.68" | 62.5 mph |
255/85R17 against the most popular 17" sizes
| Popular size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 315/70R17 | +0.29" (+0.85%) | +2.36" | +0.15" | 59.5 mph |
| 265/70R17 | -2.46" (-7.22%) | +0.39" | -1.23" | 64.7 mph |
| 285/75R17 | -0.24" (-0.7%) | +1.18" | -0.11" | 60.4 mph |
| 295/70R17 | -0.81" (-2.38%) | +1.57" | -0.40" | 61.5 mph |
| 305/70R17 | -0.26" (-0.76%) | +1.97" | -0.12" | 60.5 mph |
How the 255/85R17 numbers are worked out
The size code reads as 255 mm section width, 85% aspect ratio, R for radial construction and 17-inch wheel.
- Sidewall = 255 × 85% = 216.8 mm = 8.53"
- Diameter = 17" + 2 × 8.53" = 34.07"
- Circumference = π × 34.07" = 107.0"
- Revs per mile = 63,360" ÷ 107.0" = 592
Sizes that can replace 255/85R17 on a 17" wheel
Within 3% of 34.07". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 285/75R17 | 33.83" | 11.22" | -0.7% | 60.4 mph |
| 275/80R17 | 34.32" | 10.83" | +0.73% | 59.6 mph |
| 305/70R17 | 33.81" | 12.01" | -0.76% | 60.5 mph |
| 315/70R17 | 34.36" | 12.40" | +0.85% | 59.5 mph |
| 295/75R17 | 34.42" | 11.61" | +1.03% | 59.4 mph |
| 265/80R17 | 33.69" | 10.43" | -1.12% | 60.7 mph |
| 325/65R17 | 33.63" | 12.80" | -1.29% | 60.8 mph |
| 280/75R17 | 33.54" | 11.02" | -1.56% | 60.9 mph |
| 300/70R17 | 33.54" | 11.81" | -1.56% | 60.9 mph |
| 265/85R17 | 34.74" | 10.43" | +1.97% | 58.8 mph |
| 245/85R17 | 33.40" | 9.65" | -1.97% | 61.2 mph |
| 295/70R17 | 33.26" | 11.61" | -2.38% | 61.5 mph |
One size wider or narrower
- Narrower: 245/85R17 — 9.65" wide, 33.40" tall
- Wider: 265/85R17 — 10.43" wide, 34.74" tall
Same height on a different wheel size
- 325/75R15 15" (+0.35%)
- 315/75R15 15" (-1.38%)
- 305/75R16 16" (-0.18%)
- 285/80R16 16" (-0.35%)
- 325/70R16 16" (-0.47%)
- 265/85R16 16" (-0.97%)
- 275/85R16 16" (+1%)
- 295/80R16 16" (+1.5%)
- 315/75R16 16" (+1.56%)
- 295/75R16 16" (-1.91%)
Questions about 255/85R17
How tall is a 255/85R17 tire in inches?
A 255/85R17 tire is 34.07 inches (865 mm) tall: the 17-inch rim plus two sidewalls of 8.53 inches each.
Is 255/85R17 a 34 inch tire?
Yes. At 34.07 inches tall it is commonly called a 34-inch tire.
How many revolutions per mile does a 255/85R17 make?
About 592 revolutions per mile, based on a calculated circumference of 107.0 inches.
What size can replace 255/85R17?
285/75R17 is the closest match on a 17" rim (-0.7% height). Check load index, speed rating and clearance first.
Compare 255/85R17 against any other size with the tire size calculator.