225/45R15 tire size
225/45R15 is a metric size: 23.0" tall, 8.9" wide, on a 15" rim — about a 23x9.00R15. The sidewall is 4.0" and the tire turns 878 times per mile.
225/45R15 specs
| Overall diameter (height) | 22.97" · 584 mm |
|---|---|
| Section width | 8.86" · 225 mm |
| Sidewall height | 3.99" · 101 mm (45% of width) |
| Rim diameter | 15" |
| Circumference | 72.17" · 1.833 m |
| Revolutions per mile | 878 (546 per km) |
| Inch (flotation) equivalent | 23x9.00R15 |
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 | |
|---|---|---|---|---|---|
| 185/60R15 common | 23.74" | +3.34% | -40 mm | 62.0 mph | compare → |
| 175/65R15 | 23.96" | +4.28% | -50 mm | 62.6 mph | compare → |
| 205/50R15 | 23.07" | +0.43% | -20 mm | 60.3 mph | compare → |
| 185/55R15 | 23.01" | +0.17% | -40 mm | 60.1 mph | compare → |
| 195/55R15 | 23.44" | +2.06% | -30 mm | 61.2 mph | compare → |
| 195/50R15 | 22.68" | -1.29% | -30 mm | 59.2 mph | compare → |
| 225/50R15 | 23.86" | +3.86% | 0 mm | 62.3 mph | compare → |
| 245/40R15 | 22.72" | -1.11% | +20 mm | 59.3 mph | compare → |
| 175/55R15 | 22.58" | -1.71% | -50 mm | 59.0 mph | calculate → |
| 145/65R15 | 22.42" | -2.40% | -80 mm | 58.6 mph | calculate → |
| 155/60R15 | 22.32" | -2.83% | -70 mm | 58.3 mph | calculate → |
| 295/35R15 | 23.13" | +0.69% | +70 mm | 60.4 mph | calculate → |
| 165/60R15 | 22.80" | -0.77% | -60 mm | 59.5 mph | calculate → |
| 275/35R15 | 22.58" | -1.71% | +50 mm | 59.0 mph | calculate → |
| 205/55R15 | 23.88" | +3.94% | -20 mm | 62.4 mph | calculate → |
| 195/45R15 | 21.91" | -4.63% | -30 mm | 57.2 mph | calculate → |
| 175/60R15 | 23.27" | +1.29% | -50 mm | 60.8 mph | calculate → |
| 165/65R15 | 23.44" | +2.06% | -60 mm | 61.2 mph | calculate → |
| 22x8.00R15 | 22.00" | -4.23% | -22 mm | 57.5 mph | calculate → |
| 215/50R15 | 23.46" | +2.14% | -10 mm | 61.3 mph | calculate → |
| 175/50R15 | 21.89" | -4.71% | -50 mm | 57.2 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 | |
|---|---|---|---|---|---|
| 175/65R14 | 22.96" | -0.07% | -50 mm | 60.0 mph | compare → |
| 195/45R16 | 22.91" | -0.27% | -30 mm | 59.8 mph | calculate → |
| 205/55R14 | 22.88" | -0.41% | -20 mm | 59.8 mph | calculate → |
| 225/50R14 | 22.86" | -0.50% | 0 mm | 59.7 mph | calculate → |
| 175/50R16 | 22.89" | -0.36% | -50 mm | 59.8 mph | calculate → |
| 215/40R16 | 22.77" | -0.87% | -10 mm | 59.5 mph | calculate → |
Try another size against 225/45R15
Questions
What size is 225/45R15 in inches?
225/45R15 is about 23.0" tall and 8.9" wide on a 15-inch rim — roughly a 23x9.00R15 in inch sizing.
What does 225/45R15 mean?
225 mm section width, sidewall 45% of the width (3.99"), radial construction, 15-inch rim.
What tire sizes are equivalent to 225/45R15?
On the same 15" rim, within 3% of the diameter: 185/55R15 (+0.17%), 205/50R15 (+0.43%), 295/35R15 (+0.69%), 165/60R15 (-0.77%), 245/40R15 (-1.11%), 195/50R15 (-1.29%).
How many revolutions per mile does a 225/45R15 tire make?
About 878 revolutions per mile (circumference 72.2").
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.