Tire size
315/75R17 in inches
A 315/75R17 tire is 35.6 inches tall and 12.4 inches wide, on a 17-inch wheel. Written inch-style that is about 35.6x12.4R17 (an equivalent, not a size on sale). It rounds to a 36-inch tire.
| 315/75R17 | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 35.6 in | 904 mm |
| Section width | 12.4 in | 315 mm |
| Sidewall height | 9.3 in | 236 mm |
| Wheel (rim) diameter | 17 in | 432 mm |
| Circumference | 111.8 in | 2841 mm |
| Revolutions | 566 per mile | 352 per km |
How it's worked out
The 75 means the sidewall is 75% of the 315 mm width: 236.2 mm, or 9.30 in. Height = wheel + 2 sidewalls = 17 + 2 x 9.30 = 35.6 in.
Similar sizes
Sizes within about 3.5% of the height of 315/75R17. The last column is your real speed at an indicated 60 mph if your speedometer was set for 315/75R17.
| Size | Height | vs 315/75R17 | Real speed at 60 mph shown |
|---|---|---|---|
| 315/70R18 | 35.4 in | -0.7% | 59.6 mph |
| 325/60R20 | 35.4 in | -0.7% | 59.6 mph |
| 305/55R22 | 35.2 in | -1.1% | 59.3 mph |
| 295/65R20 | 35.1 in | -1.4% | 59.2 mph |
| 35x12.50R15 | 35.0 in | -1.7% | 59.0 mph |
| 35x12.50R17 | 35.0 in | -1.7% | 59.0 mph |
| 35x12.50R18 | 35.0 in | -1.7% | 59.0 mph |
| 35x12.50R20 | 35.0 in | -1.7% | 59.0 mph |
Going bigger from 315/75R17
If 315/75R17 is your stock size, these are the commonly sold axle ratios that come closest to your stock overall gearing on bigger tires.
| Your ratio now | On 37s |
|---|---|
| 3.21 | 3.31 exact 3.34 |
| 3.42 | 3.55 exact 3.55 |
| 3.55 | 3.73 exact 3.69 |
| 3.73 | 3.91 exact 3.88 |
| 3.91 | 4.10 exact 4.06 |
| 4.10 | 4.30 exact 4.26 |
Exact = your ratio x new height / 35.6. Front and rear axles must match on a 4WD. Not every ratio is made for every axle. Want more pull than stock? Go one step shorter. More in the regearing guide.
Questions
How tall is a 315/75R17 tire in inches?
35.6 inches (904 mm). That is the nominal height: the 17-inch wheel plus two 9.30-inch sidewalls.
What is 315/75R17 in inches?
35.6x12.4R17: 35.6 inches tall, 12.4 inches wide, for a 17-inch wheel.
Is 315/75R17 a 36-inch tire?
It measures 35.6 inches on paper, so it rounds to 36. Real tires vary a little by brand, load and wear, so check the maker's spec sheet if a fraction of an inch matters.
How many revolutions per mile does 315/75R17 do?
About 566 per mile (352 per km), from its nominal circumference of 111.8 inches.
Nominal dimensions, calculated from the size marking. Real tires differ slightly by brand, rim width, pressure and wear. Fitment depends on your vehicle, lift and wheels: this page doesn't say whether a size fits. Updated 2026-11-14.