225/55R15 tire size
225/55R15 is a metric size: 24.7" tall, 8.9" wide, on a 15" rim — about a 24.5x9.00R15. The sidewall is 4.9" and the tire turns 815 times per mile.
225/55R15 specs
| Overall diameter (height) | 24.74" · 629 mm |
|---|---|
| Section width | 8.86" · 225 mm |
| Sidewall height | 4.87" · 124 mm (55% of width) |
| Rim diameter | 15" |
| Circumference | 77.74" · 1.974 m |
| Revolutions per mile | 815 (506 per km) |
| Inch (flotation) equivalent | 24.5x9.00R15 |
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 | |
|---|---|---|---|---|---|
| 195/65R15 common | 24.98" | +0.95% | -30 mm | 60.6 mph | calculate → |
| 205/65R15 common | 25.49" | +3.02% | -20 mm | 61.8 mph | calculate → |
| 185/65R15 common | 24.47" | -1.11% | -40 mm | 59.3 mph | calculate → |
| 195/60R15 common | 24.21" | -2.15% | -30 mm | 58.7 mph | calculate → |
| 185/60R15 common | 23.74" | -4.06% | -40 mm | 57.6 mph | calculate → |
| 175/65R15 | 23.96" | -3.18% | -50 mm | 58.1 mph | calculate → |
| 205/60R15 | 24.69" | -0.24% | -20 mm | 59.9 mph | calculate → |
| 215/60R15 | 25.16" | +1.67% | -10 mm | 61.0 mph | calculate → |
| 225/50R15 | 23.86" | -3.58% | 0 mm | 57.9 mph | calculate → |
| 195/70R15 | 25.75" | +4.06% | -30 mm | 62.4 mph | calculate → |
| 275/50R15 | 25.83" | +4.38% | +50 mm | 62.6 mph | calculate → |
| 225/60R15 | 25.63" | +3.58% | 0 mm | 62.1 mph | calculate → |
| 245/50R15 | 24.65" | -0.40% | +20 mm | 59.8 mph | calculate → |
| 345/35R15 | 24.51" | -0.95% | +120 mm | 59.4 mph | calculate → |
| 205/55R15 | 23.88" | -3.50% | -20 mm | 57.9 mph | calculate → |
| 155/80R15 | 24.76" | +0.08% | -70 mm | 60.0 mph | calculate → |
| 24.5x8.00R15 | 24.50" | -0.99% | -22 mm | 59.4 mph | calculate → |
| 185/70R15 | 25.20" | +1.83% | -40 mm | 61.1 mph | calculate → |
| 235/50R15 | 24.25" | -1.99% | +10 mm | 58.8 mph | calculate → |
| 265/50R15 | 25.43" | +2.78% | +40 mm | 61.7 mph | calculate → |
| 175/70R15 | 24.65" | -0.40% | -50 mm | 59.8 mph | calculate → |
| 165/80R15 | 25.39" | +2.63% | -60 mm | 61.6 mph | calculate → |
| 165R15 | 25.65" | +3.68% | -60 mm | 62.2 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 | |
|---|---|---|---|---|---|
| 205/55R16 common | 24.88" | +0.54% | -20 mm | 60.3 mph | calculate → |
| 225/50R16 common | 24.86" | +0.46% | 0 mm | 60.3 mph | calculate → |
| 195/70R14 | 24.75" | +0.02% | -30 mm | 60.0 mph | calculate → |
| 245/45R16 | 24.68" | -0.25% | +20 mm | 59.8 mph | calculate → |
| 185/60R16 | 24.74" | -0.02% | -40 mm | 60.0 mph | calculate → |
| 225/60R14 | 24.63" | -0.46% | 0 mm | 59.7 mph | calculate → |
| 185/75R14 | 24.93" | +0.73% | -40 mm | 60.4 mph | calculate → |
Try another size against 225/55R15
Questions
What size is 225/55R15 in inches?
225/55R15 is about 24.7" tall and 8.9" wide on a 15-inch rim — roughly a 24.5x9.00R15 in inch sizing.
What does 225/55R15 mean?
225 mm section width, sidewall 55% of the width (4.87"), radial construction, 15-inch rim.
What tire sizes are equivalent to 225/55R15?
On the same 15" rim, within 3% of the diameter: 155/80R15 (+0.08%), 205/60R15 (-0.24%), 175/70R15 (-0.40%), 245/50R15 (-0.40%), 195/65R15 (+0.95%), 345/35R15 (-0.95%).
How many revolutions per mile does a 225/55R15 tire make?
About 815 revolutions per mile (circumference 77.7").
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.