185/70R13 tire size
185/70R13 is a metric size: 23.2" tall, 7.3" wide, on a 13" rim — about a 23x7.50R13. The sidewall is 5.1" and the tire turns 869 times per mile.
185/70R13 specs
| Overall diameter (height) | 23.20" · 589 mm |
|---|---|
| Section width | 7.28" · 185 mm |
| Sidewall height | 5.10" · 130 mm (70% of width) |
| Rim diameter | 13" |
| Circumference | 72.88" · 1.851 m |
| Revolutions per mile | 869 (540 per km) |
| Inch (flotation) equivalent | 23x7.50R13 |
Equivalent sizes on a 13" 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 | |
|---|---|---|---|---|---|
| 175/70R13 | 22.65" | -2.38% | -10 mm | 58.6 mph | calculate → |
| 205/60R13 | 22.69" | -2.21% | +20 mm | 58.7 mph | calculate → |
| 155/80R13 | 22.76" | -1.87% | -30 mm | 58.9 mph | calculate → |
| 165/80R13 | 23.39" | +0.85% | -20 mm | 60.5 mph | calculate → |
| 195/70R13 | 23.75" | +2.38% | +10 mm | 61.4 mph | calculate → |
Try another size against 185/70R13
Questions
What size is 185/70R13 in inches?
185/70R13 is about 23.2" tall and 7.3" wide on a 13-inch rim — roughly a 23x7.50R13 in inch sizing.
What does 185/70R13 mean?
185 mm section width, sidewall 70% of the width (5.10"), radial construction, 13-inch rim.
What tire sizes are equivalent to 185/70R13?
On the same 13" rim, within 3% of the diameter: 165/80R13 (+0.85%), 155/80R13 (-1.87%), 205/60R13 (-2.21%), 175/70R13 (-2.38%), 195/70R13 (+2.38%).
How many revolutions per mile does a 185/70R13 tire make?
About 869 revolutions per mile (circumference 72.9").
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.