34.9" tall, 12.8" wide, 9.0" sidewall
A 325/70R17 tire is 34.9 inches (887 mm) tall and 12.8 inches wide. The sidewall is 70% of the width, 9.0 inches, on a 17-inch wheel, and the tire turns about 578 times per mile.
In flotation terms that is about 34.9x12.8R17, closest to the common 35x11.50R17 (35.0"). People often call it a 35-inch tire.
The size most often compared with it is 35x12.50R17, which is 0.1" taller (+0.2%). At an indicated 60 mph you would be doing 60.1 mph on it.
| Current | New | Difference |
|---|
| Shows | Actual speed |
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Same 17" wheel, within 20 mm of width and 10 points of aspect ratio.
| Size | Diameter | Width | Sidewall | vs 325/70R17 | |
|---|---|---|---|---|---|
| 35x12.50R17 | 35.0" | 12.5" | 9.0" | +0.2% | compare |
| 305/75R17 | 35.0" | 12.0" | 9.0" | +0.3% | |
| 315/70R17 | 34.4" | 12.4" | 8.7" | −1.6% | |
| 315/75R17 | 35.6" | 12.4" | 9.3" | +2.0% | |
| 305/70R17 | 33.8" | 12.0" | 8.4" | −3.2% | |
| 315/65R17 | 33.1" | 12.4" | 8.1" | −5.1% | |
| 33x12.50R17 | 33.0" | 12.5" | 8.0" | −5.5% | |
| 37x12.50R17 | 37.0" | 12.5" | 10.0" | +6.0% | |
| 37x13.50R17 | 37.0" | 13.5" | 10.0" | +6.0% | |
| 305/65R17 | 32.6" | 12.0" | 7.8" | −6.6% |
Sizes within 2% of 34.9" on 18" or 15" or 16" wheels.
| Size | Diameter | Width | Sidewall | vs 325/70R17 | |
|---|---|---|---|---|---|
| 285/75R18 | 34.8" | 11.2" | 8.4" | −0.2% | |
| 35x12.50R15 | 35.0" | 12.5" | 10.0" | +0.2% | |
| 35x12.50R18 | 35.0" | 12.5" | 8.5" | +0.2% | |
| 305/70R18 | 34.8" | 12.0" | 8.4" | −0.3% | |
| 285/85R16 | 35.1" | 11.2" | 9.5" | +0.5% | |
| 265/80R18 | 34.7" | 10.4" | 8.3" | −0.6% |
Actual speed when the speedometer is calibrated for 325/70R17.
| Speedometer shows | on 35x12.50R17 | on 305/75R17 | on 315/70R17 |
|---|---|---|---|
| 30 mph | 30.1 mph | 30.1 mph | 29.5 mph |
| 45 mph | 45.1 mph | 45.1 mph | 44.3 mph |
| 60 mph | 60.1 mph | 60.2 mph | 59.1 mph |
| 70 mph | 70.2 mph | 70.2 mph | 68.9 mph |
34.9 inches (887 mm). The sidewall is 9.0 inches.
12.8 inches (325 mm) section width, measured sidewall to sidewall.
About 34.9x12.8R17; the closest common flotation size is 35x11.50R17 at 35.0".
35x12.50R17 is +0.2% in diameter, within the common 3% guideline. It is 0.3" narrower.