245/45R17 tire size
245/45R17 is a metric size: 25.7" tall, 9.6" wide, on a 17" rim — about a 25.5x9.50R17. The sidewall is 4.3" and the tire turns 785 times per mile.
245/45R17 specs
| Overall diameter (height) | 25.68" · 652 mm |
|---|---|
| Section width | 9.65" · 245 mm |
| Sidewall height | 4.34" · 110 mm (45% of width) |
| Rim diameter | 17" |
| Circumference | 80.68" · 2.049 m |
| Revolutions per mile | 785 (488 per km) |
| Inch (flotation) equivalent | 25.5x9.50R17 |
Equivalent sizes on a 17" 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 | |
|---|---|---|---|---|---|
| 225/45R17 common | 24.97" | -2.76% | -20 mm | 58.3 mph | compare → |
| 225/50R17 common | 25.86" | +0.69% | -20 mm | 60.4 mph | compare → |
| 225/55R17 common | 26.74" | +4.14% | -20 mm | 62.5 mph | compare → |
| 215/45R17 common | 24.62" | -4.14% | -30 mm | 57.5 mph | compare → |
| 205/50R17 common | 25.07" | -2.38% | -40 mm | 58.6 mph | compare → |
| 215/55R17 common | 26.31" | +2.45% | -30 mm | 61.5 mph | compare → |
| 215/50R17 common | 25.46" | -0.84% | -30 mm | 59.5 mph | compare → |
| 235/45R17 common | 25.33" | -1.38% | -10 mm | 59.2 mph | compare → |
| 245/40R17 common | 24.72" | -3.76% | 0 mm | 57.7 mph | compare → |
| 235/50R17 common | 26.25" | +2.22% | -10 mm | 61.3 mph | compare → |
| 255/40R17 common | 25.03" | -2.53% | +10 mm | 58.5 mph | compare → |
| 205/55R17 | 25.88" | +0.77% | -40 mm | 60.5 mph | compare → |
| 275/40R17 | 25.66" | -0.08% | +30 mm | 60.0 mph | compare → |
| 245/50R17 | 26.65" | +3.76% | 0 mm | 62.3 mph | compare → |
| 235/40R17 | 24.40" | -4.98% | -10 mm | 57.0 mph | compare → |
| 255/45R17 | 26.04" | +1.38% | +10 mm | 60.8 mph | compare → |
| 315/35R17 | 25.68" | 0.00% | +70 mm | 60.0 mph | compare → |
| 335/35R17 | 26.23" | +2.15% | +90 mm | 61.3 mph | calculate → |
| 275/35R17 | 24.58" | -4.29% | +30 mm | 57.4 mph | calculate → |
| 155/70R17 | 25.54" | -0.54% | -90 mm | 59.7 mph | calculate → |
| 285/40R17 | 25.98" | +1.15% | +40 mm | 60.7 mph | calculate → |
| 265/40R17 | 25.35" | -1.30% | +20 mm | 59.2 mph | calculate → |
| 195/60R17 | 26.21" | +2.07% | -50 mm | 61.2 mph | calculate → |
| 175/65R17 | 25.96" | +1.07% | -70 mm | 60.6 mph | calculate → |
| 145/80R17 | 26.13" | +1.76% | -100 mm | 61.1 mph | calculate → |
| 295/35R17 | 25.13" | -2.15% | +50 mm | 58.7 mph | calculate → |
| 155/80R17 | 26.76" | +4.22% | -90 mm | 62.5 mph | calculate → |
| 185/60R17 | 25.74" | +0.23% | -60 mm | 60.1 mph | calculate → |
| 26x6.00R17 | 26.00" | +1.24% | -93 mm | 60.7 mph | calculate → |
| 145/70R17 | 24.99" | -2.68% | -100 mm | 58.4 mph | calculate → |
| 165/70R17 | 26.09" | +1.61% | -80 mm | 61.0 mph | calculate → |
| 295/40R17 | 26.29" | +2.38% | +50 mm | 61.4 mph | calculate → |
| 205/60R17 | 26.69" | +3.91% | -40 mm | 62.3 mph | calculate → |
Plus / minus sizing: 16" and 18" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 245/40R18 common | 25.72" | +0.14% | 0 mm | 60.1 mph | compare → |
| 205/60R16 common | 25.69" | +0.02% | -40 mm | 60.0 mph | compare → |
| 275/35R18 common | 25.58" | -0.40% | +30 mm | 59.8 mph | compare → |
| 215/45R18 common | 25.62" | -0.25% | -30 mm | 59.9 mph | compare → |
| 225/55R16 | 25.74" | +0.25% | -20 mm | 60.1 mph | compare → |
| 285/35R18 | 25.85" | +0.67% | +40 mm | 60.4 mph | compare → |
| 315/30R18 | 25.44" | -0.94% | +70 mm | 59.4 mph | compare → |
| 335/30R18 | 25.91" | +0.90% | +90 mm | 60.5 mph | compare → |
| 245/50R16 | 25.65" | -0.14% | 0 mm | 59.9 mph | compare → |
| 275/45R16 | 25.74" | +0.25% | +30 mm | 60.1 mph | calculate → |
| 315/40R16 | 25.92" | +0.94% | +70 mm | 60.6 mph | calculate → |
Try another size against 245/45R17
Questions
What size is 245/45R17 in inches?
245/45R17 is about 25.7" tall and 9.6" wide on a 17-inch rim — roughly a 25.5x9.50R17 in inch sizing.
What does 245/45R17 mean?
245 mm section width, sidewall 45% of the width (4.34"), radial construction, 17-inch rim.
What tire sizes are equivalent to 245/45R17?
On the same 17" rim, within 3% of the diameter: 315/35R17 (0.00%), 275/40R17 (-0.08%), 185/60R17 (+0.23%), 155/70R17 (-0.54%), 225/50R17 (+0.69%), 205/55R17 (+0.77%).
How many revolutions per mile does a 245/45R17 tire make?
About 785 revolutions per mile (circumference 80.7").
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.