29.3" tall, 8.9" wide, 6.6" sidewall
A 225/75R16 tire is 29.3 inches (744 mm) tall and 8.9 inches wide. The sidewall is 75% of the width, 6.6 inches, on a 16-inch wheel, and the tire turns about 689 times per mile.
In flotation terms that is about 29.3x8.9R16. People often call it a 29-inch tire.
The size most often compared with it is 215/85R16, which is 1.1" taller (+3.8%). At an indicated 60 mph you would be doing 62.3 mph on it, more than the 3% change many shops use as a limit.
| Current | New | Difference |
|---|
| Shows | Actual speed |
|---|
Same 16" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 225/75R16 | |
|---|---|---|---|---|---|
| 245/70R16 | 29.5" | 9.6" | 6.8" | +0.7% | |
| 215/80R16 | 29.5" | 8.5" | 6.8" | +0.9% | |
| 205/80R16 | 28.9" | 8.1" | 6.5" | −1.3% | |
| 235/75R16 | 29.9" | 9.3" | 6.9" | +2.0% | |
| 245/65R16 | 28.5" | 9.6" | 6.3" | −2.6% | |
| 215/85R16 | 30.4" | 8.5" | 7.2" | +3.8% | compare |
| 245/75R16 | 30.5" | 9.6" | 7.2" | +4.0% | compare |
| 225/85R16 | 31.1" | 8.9" | 7.5" | +6.0% | |
| 245/80R16 | 31.4" | 9.6" | 7.7" | +7.3% | |
| 235/85R16 | 31.7" | 9.3" | 7.9" | +8.3% | compare |
Sizes within 2% of 29.3" on 17" or 18" or 15" wheels.
| Size | Diameter | Width | Sidewall | vs 225/75R16 | |
|---|---|---|---|---|---|
| 285/55R17 | 29.3" | 11.2" | 6.2" | +0.2% | |
| 285/50R18 | 29.2" | 11.2" | 5.6" | −0.2% | |
| 225/70R17 | 29.4" | 8.9" | 6.2" | +0.4% | |
| 315/50R17 | 29.4" | 12.4" | 6.2" | +0.4% | |
| 245/75R15 | 29.5" | 9.6" | 7.2" | +0.6% | |
| 265/55R18 | 29.5" | 10.4" | 5.7" | +0.6% |
Actual speed when the speedometer is calibrated for 225/75R16.
| Speedometer shows | on 215/85R16 | on 235/85R16 | on 245/75R16 |
|---|---|---|---|
| 30 mph | 31.1 mph | 32.5 mph | 31.2 mph |
| 45 mph | 46.7 mph | 48.8 mph | 46.8 mph |
| 60 mph | 62.3 mph | 65.0 mph | 62.4 mph |
| 70 mph | 72.6 mph | 75.8 mph | 72.8 mph |
29.3 inches (744 mm). The sidewall is 6.6 inches.
8.9 inches (225 mm) section width, measured sidewall to sidewall.
About 29.3x8.9R16.
215/85R16 is +3.8% in diameter, more than the common 3% guideline, so expect a speedometer error and check clearance. It is 0.4" narrower.