145/90R17 tire size
145/90R17 is a metric size: 27.3" tall, 5.7" wide, on a 17" rim — about a 27.5x5.50R17. The sidewall is 5.1" and the tire turns 739 times per mile.
145/90R17 specs
| Overall diameter (height) | 27.28" · 693 mm |
|---|---|
| Section width | 5.71" · 145 mm |
| Sidewall height | 5.14" · 131 mm (90% of width) |
| Rim diameter | 17" |
| Circumference | 85.69" · 2.176 m |
| Revolutions per mile | 739 (459 per km) |
| Inch (flotation) equivalent | 27.5x5.50R17 |
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" | -1.95% | +80 mm | 58.8 mph | calculate → |
| 225/65R17 common | 28.52" | +4.55% | +80 mm | 62.7 mph | calculate → |
| 235/55R17 common | 27.18" | -0.36% | +90 mm | 59.8 mph | calculate → |
| 215/55R17 common | 26.31" | -3.54% | +70 mm | 57.9 mph | calculate → |
| 225/60R17 common | 27.63" | +1.30% | +80 mm | 60.8 mph | calculate → |
| 235/60R17 common | 28.10" | +3.03% | +90 mm | 61.8 mph | calculate → |
| 215/65R17 common | 28.00" | +2.67% | +70 mm | 61.6 mph | calculate → |
| 215/60R17 common | 27.16" | -0.43% | +70 mm | 59.7 mph | calculate → |
| 235/50R17 common | 26.25" | -3.75% | +90 mm | 57.7 mph | calculate → |
| 245/50R17 | 26.65" | -2.31% | +100 mm | 58.6 mph | calculate → |
| 255/45R17 | 26.04" | -4.55% | +110 mm | 57.3 mph | calculate → |
| 245/55R17 | 27.61" | +1.23% | +100 mm | 60.7 mph | calculate → |
| 335/35R17 | 26.23" | -3.83% | +190 mm | 57.7 mph | calculate → |
| 165/80R17 | 27.39" | +0.43% | +20 mm | 60.3 mph | calculate → |
| 255/50R17 | 27.04" | -0.87% | +110 mm | 59.5 mph | calculate → |
| 305/45R17 | 27.81" | +1.95% | +160 mm | 61.2 mph | calculate → |
| 155/90R17 | 27.98" | +2.60% | +10 mm | 61.6 mph | calculate → |
| 255/55R17 | 28.04" | +2.81% | +110 mm | 61.7 mph | calculate → |
| 195/60R17 | 26.21" | -3.90% | +50 mm | 57.7 mph | calculate → |
| 285/40R17 | 25.98" | -4.76% | +140 mm | 57.1 mph | calculate → |
| 155/80R17 | 26.76" | -1.88% | +10 mm | 58.9 mph | calculate → |
| 145/80R17 | 26.13" | -4.19% | 0 mm | 57.5 mph | calculate → |
| 175/65R17 | 25.96" | -4.84% | +30 mm | 57.1 mph | calculate → |
| 275/50R17 | 27.83" | +2.02% | +130 mm | 61.2 mph | calculate → |
| 28x6.00R17 | 28.00" | +2.66% | +7 mm | 61.6 mph | calculate → |
| 26x6.00R17 | 26.00" | -4.68% | +7 mm | 57.2 mph | calculate → |
| 205/65R17 | 27.49" | +0.79% | +60 mm | 60.5 mph | calculate → |
| 205/60R17 | 26.69" | -2.17% | +60 mm | 58.7 mph | calculate → |
| 345/40R17 | 27.87" | +2.17% | +200 mm | 61.3 mph | calculate → |
| 295/40R17 | 26.29" | -3.61% | +150 mm | 57.8 mph | calculate → |
| 165/70R17 | 26.09" | -4.33% | +20 mm | 57.4 mph | calculate → |
| 245/60R17 | 28.57" | +4.76% | +100 mm | 62.9 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 | |
|---|---|---|---|---|---|
| 235/50R18 common | 27.25" | -0.09% | +90 mm | 59.9 mph | calculate → |
| 215/65R16 common | 27.00" | -1.00% | +70 mm | 59.4 mph | calculate → |
| 255/45R18 common | 27.04" | -0.88% | +110 mm | 59.5 mph | calculate → |
| 215/55R18 common | 27.31" | +0.13% | +70 mm | 60.1 mph | calculate → |
| 225/65R16 common | 27.52" | +0.88% | +80 mm | 60.5 mph | calculate → |
| 235/60R16 common | 27.10" | -0.64% | +90 mm | 59.6 mph | calculate → |
| 195/75R16 | 27.52" | +0.88% | +50 mm | 60.5 mph | calculate → |
| 205/70R16 | 27.30" | +0.09% | +60 mm | 60.1 mph | calculate → |
| 295/40R18 | 27.29" | +0.06% | +150 mm | 60.0 mph | calculate → |
| 265/45R18 | 27.39" | +0.42% | +120 mm | 60.3 mph | calculate → |
| 345/35R18 | 27.51" | +0.85% | +200 mm | 60.5 mph | calculate → |
| 145/80R18 | 27.13" | -0.52% | 0 mm | 59.7 mph | calculate → |
| 165/70R18 | 27.09" | -0.66% | +20 mm | 59.6 mph | calculate → |
| 195/60R18 | 27.21" | -0.23% | +50 mm | 59.9 mph | calculate → |
| 355/40R16 | 27.18" | -0.35% | +210 mm | 59.8 mph | calculate → |
Try another size against 145/90R17
Questions
What size is 145/90R17 in inches?
145/90R17 is about 27.3" tall and 5.7" wide on a 17-inch rim — roughly a 27.5x5.50R17 in inch sizing.
What does 145/90R17 mean?
145 mm section width, sidewall 90% of the width (5.14"), radial construction, 17-inch rim.
What tire sizes are equivalent to 145/90R17?
On the same 17" rim, within 3% of the diameter: 235/55R17 (-0.36%), 165/80R17 (+0.43%), 215/60R17 (-0.43%), 205/65R17 (+0.79%), 255/50R17 (-0.87%), 245/55R17 (+1.23%).
How many revolutions per mile does a 145/90R17 tire make?
About 739 revolutions per mile (circumference 85.7").
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.