325/30R23 tire size
325/30R23 is a metric size: 30.7" tall, 12.8" wide, on a 23" rim — about a 30.5x13.00R23. The sidewall is 3.8" and the tire turns 657 times per mile.
325/30R23 specs
| Overall diameter (height) | 30.68" · 779 mm |
|---|---|
| Section width | 12.80" · 325 mm |
| Sidewall height | 3.84" · 98 mm (30% of width) |
| Rim diameter | 23" |
| Circumference | 96.38" · 2.448 m |
| Revolutions per mile | 657 (409 per km) |
| Inch (flotation) equivalent | 30.5x13.00R23 |
Equivalent sizes on a 23" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 285/35R23 | 30.85" | +0.58% | -40 mm | 60.3 mph | calculate → |
| 315/30R23 | 30.44" | -0.77% | -10 mm | 59.5 mph | calculate → |
| 295/35R23 | 31.13" | +1.48% | -30 mm | 60.9 mph | calculate → |
| 335/30R23 | 30.91" | +0.77% | +10 mm | 60.5 mph | calculate → |
| 255/40R23 | 31.03" | +1.16% | -70 mm | 60.7 mph | calculate → |
| 305/35R23 | 31.41" | +2.37% | -20 mm | 61.4 mph | calculate → |
| 275/35R23 | 30.58" | -0.32% | -50 mm | 59.8 mph | calculate → |
| 295/30R23 | 29.97" | -2.31% | -30 mm | 58.6 mph | calculate → |
Try another size against 325/30R23
Questions
What size is 325/30R23 in inches?
325/30R23 is about 30.7" tall and 12.8" wide on a 23-inch rim — roughly a 30.5x13.00R23 in inch sizing.
What does 325/30R23 mean?
325 mm section width, sidewall 30% of the width (3.84"), radial construction, 23-inch rim.
What tire sizes are equivalent to 325/30R23?
On the same 23" rim, within 3% of the diameter: 275/35R23 (-0.32%), 285/35R23 (+0.58%), 335/30R23 (+0.77%), 315/30R23 (-0.77%), 255/40R23 (+1.16%), 295/35R23 (+1.48%).
How many revolutions per mile does a 325/30R23 tire make?
About 657 revolutions per mile (circumference 96.4").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.