175/55R15 tire size
175/55R15 is a metric size: 22.6" tall, 6.9" wide, on a 15" rim — about a 22.5x7.00R15. The sidewall is 3.8" and the tire turns 893 times per mile.
175/55R15 specs
| Overall diameter (height) | 22.58" · 574 mm |
|---|---|
| Section width | 6.89" · 175 mm |
| Sidewall height | 3.79" · 96 mm (55% of width) |
| Rim diameter | 15" |
| Circumference | 70.93" · 1.802 m |
| Revolutions per mile | 893 (555 per km) |
| Inch (flotation) equivalent | 22.5x7.00R15 |
Equivalent sizes on a 15" 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 | |
|---|---|---|---|---|---|
| 205/50R15 | 23.07" | +2.18% | +30 mm | 61.3 mph | calculate → |
| 185/55R15 | 23.01" | +1.92% | +10 mm | 61.2 mph | calculate → |
| 195/55R15 | 23.44" | +3.84% | +20 mm | 62.3 mph | calculate → |
| 195/50R15 | 22.68" | +0.44% | +20 mm | 60.3 mph | calculate → |
| 225/45R15 | 22.97" | +1.74% | +50 mm | 61.0 mph | calculate → |
| 245/40R15 | 22.72" | +0.61% | +70 mm | 60.4 mph | calculate → |
| 145/65R15 | 22.42" | -0.70% | -30 mm | 59.6 mph | calculate → |
| 155/60R15 | 22.32" | -1.13% | -20 mm | 59.3 mph | calculate → |
| 275/35R15 | 22.58" | 0.00% | +100 mm | 60.0 mph | calculate → |
| 165/60R15 | 22.80" | +0.96% | -10 mm | 60.6 mph | calculate → |
| 295/35R15 | 23.13" | +2.44% | +120 mm | 61.5 mph | calculate → |
| 195/45R15 | 21.91" | -2.96% | +20 mm | 58.2 mph | calculate → |
| 22x8.00R15 | 22.00" | -2.56% | +28 mm | 58.5 mph | calculate → |
| 175/60R15 | 23.27" | +3.05% | 0 mm | 61.8 mph | calculate → |
| 165/65R15 | 23.44" | +3.84% | -10 mm | 62.3 mph | calculate → |
| 165/50R15 | 21.50" | -4.80% | -10 mm | 57.1 mph | calculate → |
| 175/50R15 | 21.89" | -3.05% | 0 mm | 58.2 mph | calculate → |
| 215/50R15 | 23.46" | +3.92% | +40 mm | 62.4 mph | calculate → |
Plus / minus sizing: 14" and 16" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 185/60R14 | 22.74" | +0.71% | +10 mm | 60.4 mph | calculate → |
| 205/40R16 | 22.46" | -0.54% | +30 mm | 59.7 mph | calculate → |
| 165/65R14 | 22.44" | -0.59% | -10 mm | 59.6 mph | calculate → |
| 195/55R14 | 22.44" | -0.59% | +20 mm | 59.6 mph | calculate → |
| 215/40R16 | 22.77" | +0.85% | +40 mm | 60.5 mph | calculate → |
Try another size against 175/55R15
Questions
What size is 175/55R15 in inches?
175/55R15 is about 22.6" tall and 6.9" wide on a 15-inch rim — roughly a 22.5x7.00R15 in inch sizing.
What does 175/55R15 mean?
175 mm section width, sidewall 55% of the width (3.79"), radial construction, 15-inch rim.
What tire sizes are equivalent to 175/55R15?
On the same 15" rim, within 3% of the diameter: 275/35R15 (0.00%), 195/50R15 (+0.44%), 245/40R15 (+0.61%), 145/65R15 (-0.70%), 165/60R15 (+0.96%), 155/60R15 (-1.13%).
How many revolutions per mile does a 175/55R15 tire make?
About 893 revolutions per mile (circumference 70.9").
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.