185/55R16 tire size
185/55R16 is a metric size: 24.0" tall, 7.3" wide, on a 16" rim — about a 24x7.50R16. The sidewall is 4.0" and the tire turns 840 times per mile.
185/55R16 specs
| Overall diameter (height) | 24.01" · 610 mm |
|---|---|
| Section width | 7.28" · 185 mm |
| Sidewall height | 4.01" · 102 mm (55% of width) |
| Rim diameter | 16" |
| Circumference | 75.44" · 1.916 m |
| Revolutions per mile | 840 (522 per km) |
| Inch (flotation) equivalent | 24x7.50R16 |
Equivalent sizes on a 16" 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 | |
|---|---|---|---|---|---|
| 205/55R16 common | 24.88" | +3.61% | +20 mm | 62.2 mph | compare → |
| 195/55R16 common | 24.44" | +1.80% | +10 mm | 61.1 mph | compare → |
| 225/50R16 common | 24.86" | +3.53% | +40 mm | 62.1 mph | compare → |
| 205/50R16 | 24.07" | +0.25% | +20 mm | 60.1 mph | compare → |
| 195/50R16 | 23.68" | -1.39% | +10 mm | 59.2 mph | compare → |
| 205/45R16 | 23.26" | -3.12% | +20 mm | 58.1 mph | compare → |
| 245/45R16 | 24.68" | +2.79% | +60 mm | 61.7 mph | compare → |
| 215/45R16 | 23.62" | -1.64% | +30 mm | 59.0 mph | calculate → |
| 185/60R16 | 24.74" | +3.03% | 0 mm | 61.8 mph | calculate → |
| 195/45R16 | 22.91" | -4.59% | +10 mm | 57.2 mph | calculate → |
| 225/45R16 | 23.97" | -0.16% | +40 mm | 59.9 mph | calculate → |
| 175/60R16 | 24.27" | +1.07% | -10 mm | 60.6 mph | calculate → |
| 175/55R16 | 23.58" | -1.80% | -10 mm | 58.9 mph | calculate → |
| 185/50R16 | 23.28" | -3.03% | 0 mm | 58.2 mph | calculate → |
| 215/50R16 | 24.46" | +1.89% | +30 mm | 61.1 mph | calculate → |
| 145/80R16 | 25.13" | +4.67% | -40 mm | 62.8 mph | calculate → |
| 175/50R16 | 22.89" | -4.67% | -10 mm | 57.2 mph | calculate → |
Plus / minus sizing: 15" and 17" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 195/60R15 common | 24.21" | +0.84% | +10 mm | 60.5 mph | compare → |
| 175/65R15 | 23.96" | -0.23% | -10 mm | 59.9 mph | compare → |
| 225/50R15 | 23.86" | -0.64% | +40 mm | 59.6 mph | compare → |
| 225/40R17 | 24.09" | +0.31% | +40 mm | 60.2 mph | calculate → |
| 195/45R17 | 23.91" | -0.43% | +10 mm | 59.7 mph | calculate → |
| 205/55R15 | 23.88" | -0.56% | +20 mm | 59.7 mph | calculate → |
Try another size against 185/55R16
Questions
What size is 185/55R16 in inches?
185/55R16 is about 24.0" tall and 7.3" wide on a 16-inch rim — roughly a 24x7.50R16 in inch sizing.
What does 185/55R16 mean?
185 mm section width, sidewall 55% of the width (4.01"), radial construction, 16-inch rim.
What tire sizes are equivalent to 185/55R16?
On the same 16" rim, within 3% of the diameter: 225/45R16 (-0.16%), 205/50R16 (+0.25%), 175/60R16 (+1.07%), 195/50R16 (-1.39%), 215/45R16 (-1.64%), 195/55R16 (+1.80%).
How many revolutions per mile does a 185/55R16 tire make?
About 840 revolutions per mile (circumference 75.4").
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.