Tire size
235/80R17 in inches
A 235/80R17 tire is 31.8 inches tall and 9.3 inches wide, on a 17-inch wheel. Written inch-style that is about 31.8x9.3R17 (an equivalent, not a size on sale). It rounds to a 32-inch tire.
| 235/80R17 | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 31.8 in | 808 mm |
| Section width | 9.3 in | 235 mm |
| Sidewall height | 7.4 in | 188 mm |
| Wheel (rim) diameter | 17 in | 432 mm |
| Circumference | 99.9 in | 2538 mm |
| Revolutions | 634 per mile | 394 per km |
How it's worked out
The 80 means the sidewall is 80% of the 235 mm width: 188.0 mm, or 7.40 in. Height = wheel + 2 sidewalls = 17 + 2 x 7.40 = 31.8 in.
Similar sizes
Sizes within about 3.5% of the height of 235/80R17. The last column is your real speed at an indicated 60 mph if your speedometer was set for 235/80R17.
| Size | Height | vs 235/80R17 | Real speed at 60 mph shown |
|---|---|---|---|
| 235/85R16 | 31.7 in | -0.2% | 59.9 mph |
| 285/70R16 | 31.7 in | -0.3% | 59.8 mph |
| 275/55R20 | 31.9 in | +0.3% | 60.2 mph |
| 265/75R16 | 31.6 in | -0.5% | 59.7 mph |
| 295/50R20 | 31.6 in | -0.6% | 59.6 mph |
| 265/70R17 | 31.6 in | -0.6% | 59.6 mph |
| 32x11.50R15 | 32.0 in | +0.6% | 60.4 mph |
| 305/50R20 | 32.0 in | +0.6% | 60.4 mph |
Going bigger from 235/80R17
If 235/80R17 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 33s | On 35s | On 37s |
|---|---|---|---|
| 3.21 | 3.31 exact 3.33 | 3.55 exact 3.53 | 3.73 exact 3.73 |
| 3.42 | 3.55 exact 3.55 | 3.73 exact 3.76 | 3.91 exact 3.98 |
| 3.55 | 3.73 exact 3.68 | 3.91 exact 3.91 | 4.10 exact 4.13 |
| 3.73 | 3.91 exact 3.87 | 4.10 exact 4.10 | 4.30 exact 4.34 |
| 3.91 | 4.10 exact 4.06 | 4.30 exact 4.30 | 4.56 exact 4.55 |
| 4.10 | 4.30 exact 4.25 | 4.56 exact 4.51 | 4.88 exact 4.77 |
Exact = your ratio x new height / 31.8. 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 235/80R17 tire in inches?
31.8 inches (808 mm). That is the nominal height: the 17-inch wheel plus two 7.40-inch sidewalls.
What is 235/80R17 in inches?
31.8x9.3R17: 31.8 inches tall, 9.3 inches wide, for a 17-inch wheel.
Is 235/80R17 a 32-inch tire?
It measures 31.8 inches on paper, so it rounds to 32. 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 235/80R17 do?
About 634 per mile (394 per km), from its nominal circumference of 99.9 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.