165/50R15 tire size
165/50R15 is a metric size: 21.5" tall, 6.5" wide, on a 15" rim — about a 21.5x6.50R15. The sidewall is 3.2" and the tire turns 938 times per mile.
165/50R15 specs
| Overall diameter (height) | 21.50" · 546 mm |
|---|---|
| Section width | 6.50" · 165 mm |
| Sidewall height | 3.25" · 83 mm (50% of width) |
| Rim diameter | 15" |
| Circumference | 67.53" · 1.715 m |
| Revolutions per mile | 938 (583 per km) |
| Inch (flotation) equivalent | 21.5x6.50R15 |
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 | |
|---|---|---|---|---|---|
| 155/60R15 | 22.32" | +3.85% | -10 mm | 62.3 mph | calculate → |
| 145/65R15 | 22.42" | +4.30% | -20 mm | 62.6 mph | calculate → |
| 195/45R15 | 21.91" | +1.92% | +30 mm | 61.2 mph | calculate → |
| 22x8.00R15 | 22.00" | +2.34% | +38 mm | 61.4 mph | calculate → |
| 175/50R15 | 21.89" | +1.83% | +10 mm | 61.1 mph | calculate → |
Try another size against 165/50R15
Questions
What size is 165/50R15 in inches?
165/50R15 is about 21.5" tall and 6.5" wide on a 15-inch rim — roughly a 21.5x6.50R15 in inch sizing.
What does 165/50R15 mean?
165 mm section width, sidewall 50% of the width (3.25"), radial construction, 15-inch rim.
What tire sizes are equivalent to 165/50R15?
On the same 15" rim, within 3% of the diameter: 175/50R15 (+1.83%), 195/45R15 (+1.92%), 22x8.00R15 (+2.34%), 155/60R15 (+3.85%), 145/65R15 (+4.30%).
How many revolutions per mile does a 165/50R15 tire make?
About 938 revolutions per mile (circumference 67.5").
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.