Tire size
225/75R15 in inches
A 225/75R15 tire is 28.3 inches tall and 8.9 inches wide, on a 15-inch wheel. Written inch-style that is about 28.3x8.9R15 (an equivalent, not a size on sale). It rounds to a 28-inch tire.
| 225/75R15 | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 28.3 in | 718 mm |
| Section width | 8.9 in | 225 mm |
| Sidewall height | 6.6 in | 169 mm |
| Wheel (rim) diameter | 15 in | 381 mm |
| Circumference | 88.9 in | 2257 mm |
| Revolutions | 713 per mile | 443 per km |
How it's worked out
The 75 means the sidewall is 75% of the 225 mm width: 168.8 mm, or 6.64 in. Height = wheel + 2 sidewalls = 15 + 2 x 6.64 = 28.3 in.
Similar sizes
Sizes within about 3.5% of the height of 225/75R15. The last column is your real speed at an indicated 60 mph if your speedometer was set for 225/75R15.
| Size | Height | vs 225/75R15 | Real speed at 60 mph shown |
|---|---|---|---|
| 225/65R17 | 28.5 in | +0.8% | 60.5 mph |
| 215/75R15 | 27.7 in | -2.1% | 58.7 mph |
| 235/75R15 | 28.9 in | +2.1% | 61.3 mph |
| 235/70R16 | 29.0 in | +2.4% | 61.4 mph |
| 235/65R17 | 29.0 in | +2.6% | 61.6 mph |
| 235/60R18 | 29.1 in | +2.9% | 61.7 mph |
Going bigger from 225/75R15
If 225/75R15 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 | 3.73 exact 3.74 | 3.91 exact 3.97 | 4.10 exact 4.20 |
| 3.42 | 3.91 exact 3.99 | 4.30 exact 4.23 | 4.56 exact 4.47 |
| 3.55 | 4.10 exact 4.14 | 4.30 exact 4.39 | 4.56 exact 4.64 |
| 3.73 | 4.30 exact 4.35 | 4.56 exact 4.62 | 4.88 exact 4.88 |
| 3.91 | 4.56 exact 4.56 | 4.88 exact 4.84 | 5.13 exact 5.11 |
| 4.10 | 4.88 exact 4.78 | 5.13 exact 5.07 | 5.38 exact 5.36 |
Exact = your ratio x new height / 28.3. 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 225/75R15 tire in inches?
28.3 inches (718 mm). That is the nominal height: the 15-inch wheel plus two 6.64-inch sidewalls.
What is 225/75R15 in inches?
28.3x8.9R15: 28.3 inches tall, 8.9 inches wide, for a 15-inch wheel.
Is 225/75R15 a 28-inch tire?
It measures 28.3 inches on paper, so it rounds to 28. 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 225/75R15 do?
About 713 per mile (443 per km), from its nominal circumference of 88.9 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.