315/25R23 tire size
315/25R23 is a metric size: 29.2" tall, 12.4" wide, on a 23" rim — about a 29x12.50R23. The sidewall is 3.1" and the tire turns 691 times per mile.
315/25R23 specs
| Overall diameter (height) | 29.20" · 742 mm |
|---|---|
| Section width | 12.40" · 315 mm |
| Sidewall height | 3.10" · 79 mm (25% of width) |
| Rim diameter | 23" |
| Circumference | 91.74" · 2.330 m |
| Revolutions per mile | 691 (429 per km) |
| Inch (flotation) equivalent | 29x12.50R23 |
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 | |
|---|---|---|---|---|---|
| 295/30R23 | 29.97" | +2.63% | -20 mm | 61.6 mph | calculate → |
Try another size against 315/25R23
Questions
What size is 315/25R23 in inches?
315/25R23 is about 29.2" tall and 12.4" wide on a 23-inch rim — roughly a 29x12.50R23 in inch sizing.
What does 315/25R23 mean?
315 mm section width, sidewall 25% of the width (3.10"), radial construction, 23-inch rim.
What tire sizes are equivalent to 315/25R23?
On the same 23" rim, within 3% of the diameter: 295/30R23 (+2.63%).
How many revolutions per mile does a 315/25R23 tire make?
About 691 revolutions per mile (circumference 91.7").
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.