255/45R17 tire size
255/45R17 is a metric size: 26.0" tall, 10.0" wide, on a 17" rim — about a 26x10.00R17. The sidewall is 4.5" and the tire turns 775 times per mile.
255/45R17 specs
| Overall diameter (height) | 26.04" · 661 mm |
|---|---|
| Section width | 10.04" · 255 mm |
| Sidewall height | 4.52" · 115 mm (45% of width) |
| Rim diameter | 17" |
| Circumference | 81.79" · 2.078 m |
| Revolutions per mile | 775 (481 per km) |
| Inch (flotation) equivalent | 26x10.00R17 |
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" | -4.08% | -30 mm | 57.6 mph | compare → |
| 225/50R17 common | 25.86" | -0.68% | -30 mm | 59.6 mph | compare → |
| 225/55R17 common | 26.74" | +2.72% | -30 mm | 61.6 mph | compare → |
| 235/55R17 common | 27.18" | +4.39% | -20 mm | 62.6 mph | compare → |
| 205/50R17 common | 25.07" | -3.70% | -50 mm | 57.8 mph | compare → |
| 215/55R17 common | 26.31" | +1.06% | -40 mm | 60.6 mph | compare → |
| 215/50R17 common | 25.46" | -2.19% | -40 mm | 58.7 mph | compare → |
| 235/45R17 common | 25.33" | -2.72% | -20 mm | 58.4 mph | compare → |
| 245/45R17 common | 25.68" | -1.36% | -10 mm | 59.2 mph | compare → |
| 215/60R17 common | 27.16" | +4.31% | -40 mm | 62.6 mph | compare → |
| 235/50R17 common | 26.25" | +0.83% | -20 mm | 60.5 mph | compare → |
| 255/40R17 common | 25.03" | -3.86% | 0 mm | 57.7 mph | compare → |
| 205/55R17 | 25.88" | -0.60% | -50 mm | 59.6 mph | compare → |
| 275/40R17 | 25.66" | -1.44% | +20 mm | 59.1 mph | compare → |
| 245/50R17 | 26.65" | +2.34% | -10 mm | 61.4 mph | compare → |
| 315/35R17 | 25.68" | -1.36% | +60 mm | 59.2 mph | compare → |
| 335/35R17 | 26.23" | +0.76% | +80 mm | 60.5 mph | calculate → |
| 285/40R17 | 25.98" | -0.23% | +30 mm | 59.9 mph | calculate → |
| 195/60R17 | 26.21" | +0.68% | -60 mm | 60.4 mph | calculate → |
| 155/70R17 | 25.54" | -1.89% | -100 mm | 58.9 mph | calculate → |
| 265/40R17 | 25.35" | -2.65% | +10 mm | 58.4 mph | calculate → |
| 255/50R17 | 27.04" | +3.86% | 0 mm | 62.3 mph | calculate → |
| 175/65R17 | 25.96" | -0.30% | -80 mm | 59.8 mph | calculate → |
| 145/80R17 | 26.13" | +0.38% | -110 mm | 60.2 mph | calculate → |
| 155/80R17 | 26.76" | +2.80% | -100 mm | 61.7 mph | calculate → |
| 295/35R17 | 25.13" | -3.48% | +40 mm | 57.9 mph | calculate → |
| 26x6.00R17 | 26.00" | -0.14% | -103 mm | 59.9 mph | calculate → |
| 185/60R17 | 25.74" | -1.13% | -70 mm | 59.3 mph | calculate → |
| 145/70R17 | 24.99" | -4.01% | -110 mm | 57.6 mph | calculate → |
| 145/90R17 | 27.28" | +4.76% | -110 mm | 62.9 mph | calculate → |
| 165/70R17 | 26.09" | +0.23% | -90 mm | 60.1 mph | calculate → |
| 295/40R17 | 26.29" | +0.98% | +40 mm | 60.6 mph | calculate → |
| 205/60R17 | 26.69" | +2.50% | -50 mm | 61.5 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 | |
|---|---|---|---|---|---|
| 225/45R18 common | 25.97" | -0.24% | -30 mm | 59.9 mph | compare → |
| 215/60R16 common | 26.16" | +0.47% | -40 mm | 60.3 mph | compare → |
| 255/40R18 common | 26.03" | -0.02% | 0 mm | 60.0 mph | compare → |
| 285/35R18 | 25.85" | -0.70% | +30 mm | 59.6 mph | compare → |
| 295/35R18 | 26.13" | +0.36% | +40 mm | 60.2 mph | compare → |
| 335/30R18 | 25.91" | -0.47% | +80 mm | 59.7 mph | compare → |
| 255/50R16 | 26.04" | +0.02% | 0 mm | 60.0 mph | calculate → |
| 145/90R16 | 26.28" | +0.92% | -110 mm | 60.6 mph | calculate → |
| 235/55R16 | 26.18" | +0.54% | -20 mm | 60.3 mph | calculate → |
| 195/65R16 | 25.98" | -0.21% | -60 mm | 59.9 mph | calculate → |
| 26x12.00R18 | 26.00" | -0.14% | +50 mm | 59.9 mph | calculate → |
| 26x6.00R18 | 26.00" | -0.14% | -103 mm | 59.9 mph | calculate → |
| 26x8.00R18 | 26.00" | -0.14% | -52 mm | 59.9 mph | calculate → |
| 145/70R18 | 25.99" | -0.17% | -110 mm | 59.9 mph | calculate → |
| 26x11.50R16 | 26.00" | -0.14% | +37 mm | 59.9 mph | calculate → |
| 315/40R16 | 25.92" | -0.44% | +60 mm | 59.7 mph | calculate → |
| 345/30R18 | 26.15" | +0.44% | +90 mm | 60.3 mph | calculate → |
Try another size against 255/45R17
Questions
What size is 255/45R17 in inches?
255/45R17 is about 26.0" tall and 10.0" wide on a 17-inch rim — roughly a 26x10.00R17 in inch sizing.
What does 255/45R17 mean?
255 mm section width, sidewall 45% of the width (4.52"), radial construction, 17-inch rim.
What tire sizes are equivalent to 255/45R17?
On the same 17" rim, within 3% of the diameter: 26x6.00R17 (-0.14%), 165/70R17 (+0.23%), 285/40R17 (-0.23%), 175/65R17 (-0.30%), 145/80R17 (+0.38%), 205/55R17 (-0.60%).
How many revolutions per mile does a 255/45R17 tire make?
About 775 revolutions per mile (circumference 81.8").
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.