245/55R17 tire size
245/55R17 is a metric size: 27.6" tall, 9.6" wide, on a 17" rim — about a 27.5x9.50R17. The sidewall is 5.3" and the tire turns 730 times per mile.
245/55R17 specs
| Overall diameter (height) | 27.61" · 701 mm |
|---|---|
| Section width | 9.65" · 245 mm |
| Sidewall height | 5.31" · 135 mm (55% of width) |
| Rim diameter | 17" |
| Circumference | 86.74" · 2.203 m |
| Revolutions per mile | 730 (454 per km) |
| Inch (flotation) equivalent | 27.5x9.50R17 |
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 | |
|---|---|---|---|---|---|
| 225/55R17 common | 26.74" | -3.14% | -20 mm | 58.1 mph | calculate → |
| 225/65R17 common | 28.52" | +3.28% | -20 mm | 62.0 mph | calculate → |
| 235/55R17 common | 27.18" | -1.57% | -10 mm | 59.1 mph | calculate → |
| 215/55R17 common | 26.31" | -4.71% | -30 mm | 57.2 mph | calculate → |
| 225/60R17 common | 27.63" | +0.07% | -20 mm | 60.0 mph | calculate → |
| 235/60R17 common | 28.10" | +1.78% | -10 mm | 61.1 mph | calculate → |
| 215/65R17 common | 28.00" | +1.43% | -30 mm | 60.9 mph | calculate → |
| 215/60R17 common | 27.16" | -1.64% | -30 mm | 59.0 mph | calculate → |
| 235/50R17 common | 26.25" | -4.92% | -10 mm | 57.0 mph | calculate → |
| 245/50R17 | 26.65" | -3.49% | 0 mm | 57.9 mph | calculate → |
| 275/55R17 | 28.91" | +4.71% | +30 mm | 62.8 mph | calculate → |
| 165/90R17 | 28.69" | +3.92% | -80 mm | 62.4 mph | calculate → |
| 215/70R17 | 28.85" | +4.49% | -30 mm | 62.7 mph | calculate → |
| 335/35R17 | 26.23" | -4.99% | +90 mm | 57.0 mph | calculate → |
| 305/45R17 | 27.81" | +0.71% | +60 mm | 60.4 mph | calculate → |
| 165/80R17 | 27.39" | -0.78% | -80 mm | 59.5 mph | calculate → |
| 155/90R17 | 27.98" | +1.35% | -90 mm | 60.8 mph | calculate → |
| 255/55R17 | 28.04" | +1.57% | +10 mm | 60.9 mph | calculate → |
| 255/50R17 | 27.04" | -2.07% | +10 mm | 58.8 mph | calculate → |
| 155/80R17 | 26.76" | -3.07% | -90 mm | 58.2 mph | calculate → |
| 275/50R17 | 27.83" | +0.78% | +30 mm | 60.5 mph | calculate → |
| 145/90R17 | 27.28" | -1.21% | -100 mm | 59.3 mph | calculate → |
| 28x6.00R17 | 28.00" | +1.41% | -93 mm | 60.8 mph | calculate → |
| 205/65R17 | 27.49" | -0.43% | -40 mm | 59.7 mph | calculate → |
| 345/40R17 | 27.87" | +0.93% | +100 mm | 60.6 mph | calculate → |
| 205/60R17 | 26.69" | -3.35% | -40 mm | 58.0 mph | calculate → |
| 245/60R17 | 28.57" | +3.49% | 0 mm | 62.1 mph | calculate → |
| 295/40R17 | 26.29" | -4.78% | +50 mm | 57.1 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 | |
|---|---|---|---|---|---|
| 225/55R18 common | 27.74" | +0.48% | -20 mm | 60.3 mph | calculate → |
| 215/70R16 common | 27.85" | +0.87% | -30 mm | 60.5 mph | calculate → |
| 245/50R18 common | 27.65" | +0.13% | 0 mm | 60.1 mph | calculate → |
| 225/65R16 common | 27.52" | -0.34% | -20 mm | 59.8 mph | calculate → |
| 195/75R16 | 27.52" | -0.34% | -50 mm | 59.8 mph | calculate → |
| 275/45R18 | 27.74" | +0.48% | +30 mm | 60.3 mph | calculate → |
| 265/45R18 | 27.39" | -0.80% | +20 mm | 59.5 mph | calculate → |
| 345/35R18 | 27.51" | -0.37% | +100 mm | 59.8 mph | calculate → |
| 305/40R18 | 27.61" | -0.01% | +60 mm | 60.0 mph | calculate → |
| 145/85R18 | 27.70" | +0.34% | -100 mm | 60.2 mph | calculate → |
| 295/50R16 | 27.61" | +0.01% | +50 mm | 60.0 mph | calculate → |
| 205/60R18 | 27.69" | +0.27% | -40 mm | 60.2 mph | calculate → |
Try another size against 245/55R17
Questions
What size is 245/55R17 in inches?
245/55R17 is about 27.6" tall and 9.6" wide on a 17-inch rim — roughly a 27.5x9.50R17 in inch sizing.
What does 245/55R17 mean?
245 mm section width, sidewall 55% of the width (5.31"), radial construction, 17-inch rim.
What tire sizes are equivalent to 245/55R17?
On the same 17" rim, within 3% of the diameter: 225/60R17 (+0.07%), 205/65R17 (-0.43%), 305/45R17 (+0.71%), 165/80R17 (-0.78%), 275/50R17 (+0.78%), 345/40R17 (+0.93%).
How many revolutions per mile does a 245/55R17 tire make?
About 730 revolutions per mile (circumference 86.7").
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.