225/45R16 tire size
225/45R16 is a metric size: 24.0" tall, 8.9" wide, on a 16" rim — about a 24x9.00R16. The sidewall is 4.0" and the tire turns 841 times per mile.
225/45R16 specs
| Overall diameter (height) | 23.97" · 609 mm |
|---|---|
| Section width | 8.86" · 225 mm |
| Sidewall height | 3.99" · 101 mm (45% of width) |
| Rim diameter | 16" |
| Circumference | 75.31" · 1.913 m |
| Revolutions per mile | 841 (523 per km) |
| Inch (flotation) equivalent | 24x9.00R16 |
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" | +3.78% | -20 mm | 62.3 mph | calculate → |
| 195/55R16 common | 24.44" | +1.97% | -30 mm | 61.2 mph | calculate → |
| 225/50R16 common | 24.86" | +3.70% | 0 mm | 62.2 mph | calculate → |
| 205/50R16 | 24.07" | +0.41% | -20 mm | 60.2 mph | calculate → |
| 195/50R16 | 23.68" | -1.23% | -30 mm | 59.3 mph | calculate → |
| 185/55R16 | 24.01" | +0.16% | -40 mm | 60.1 mph | calculate → |
| 205/45R16 | 23.26" | -2.96% | -20 mm | 58.2 mph | calculate → |
| 245/45R16 | 24.68" | +2.96% | +20 mm | 61.8 mph | calculate → |
| 215/45R16 | 23.62" | -1.48% | -10 mm | 59.1 mph | calculate → |
| 185/60R16 | 24.74" | +3.20% | -40 mm | 61.9 mph | calculate → |
| 195/45R16 | 22.91" | -4.43% | -30 mm | 57.3 mph | calculate → |
| 175/60R16 | 24.27" | +1.23% | -50 mm | 60.7 mph | calculate → |
| 175/55R16 | 23.58" | -1.64% | -50 mm | 59.0 mph | calculate → |
| 185/50R16 | 23.28" | -2.87% | -40 mm | 58.3 mph | calculate → |
| 215/50R16 | 24.46" | +2.05% | -10 mm | 61.2 mph | calculate → |
| 175/50R16 | 22.89" | -4.52% | -50 mm | 57.3 mph | calculate → |
| 145/80R16 | 25.13" | +4.84% | -80 mm | 62.9 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 | |
|---|---|---|---|---|---|
| 185/60R15 common | 23.74" | -0.97% | -40 mm | 59.4 mph | calculate → |
| 175/65R15 | 23.96" | -0.07% | -50 mm | 60.0 mph | calculate → |
| 215/40R17 | 23.77" | -0.84% | -10 mm | 59.5 mph | calculate → |
| 225/50R15 | 23.86" | -0.48% | 0 mm | 59.7 mph | calculate → |
| 225/40R17 | 24.09" | +0.48% | 0 mm | 60.3 mph | calculate → |
| 195/45R17 | 23.91" | -0.26% | -30 mm | 59.8 mph | calculate → |
| 205/55R15 | 23.88" | -0.39% | -20 mm | 59.8 mph | calculate → |
| 245/35R17 | 23.75" | -0.92% | +20 mm | 59.4 mph | calculate → |
Try another size against 225/45R16
Questions
What size is 225/45R16 in inches?
225/45R16 is about 24.0" tall and 8.9" wide on a 16-inch rim — roughly a 24x9.00R16 in inch sizing.
What does 225/45R16 mean?
225 mm section width, sidewall 45% of the width (3.99"), radial construction, 16-inch rim.
What tire sizes are equivalent to 225/45R16?
On the same 16" rim, within 3% of the diameter: 185/55R16 (+0.16%), 205/50R16 (+0.41%), 195/50R16 (-1.23%), 175/60R16 (+1.23%), 215/45R16 (-1.48%), 175/55R16 (-1.64%).
How many revolutions per mile does a 225/45R16 tire make?
About 841 revolutions per mile (circumference 75.3").
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.