Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 255/45-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 26.04 (661.3) | -2.2 (-55.9) -7.8% |
| Width inches (mm) | 12.8 (325) | 10.04 (255) | -2.76 (-70) -21.5% |
| Circum. inches (mm) | 88.71 (2253.15) | 81.79 (2077.54) | -6.91 (-175.62) -7.8% |
| Sidewall Height inches (mm) | 5.12 (130) | 4.52 (114.75) | -0.6 (-15.25) -11.7% |
| Revolutions per mile (km) | 714.26 (443.82) | 774.64 (481.34) | 60.38 (37.52) 8.5% |
255/45-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.44 mph (29.68 km/h) |
| 25 mph (40.23 km/h) | 23.05 mph (37.1 km/h) |
| 30 mph (48.28 km/h) | 27.66 mph (44.52 km/h) |
| 35 mph (56.33 km/h) | 32.27 mph (51.94 km/h) |
| 40 mph (64.37 km/h) | 36.88 mph (59.36 km/h) |
| 45 mph (72.42 km/h) | 41.49 mph (66.78 km/h) |
| 50 mph (80.47 km/h) | 46.1 mph (74.2 km/h) |
| 55 mph (88.51 km/h) | 50.71 mph (81.62 km/h) |
| 60 mph (96.56 km/h) | 55.32 mph (89.03 km/h) |
| 65 mph (104.61 km/h) | 59.93 mph (96.45 km/h) |
| 70 mph (112.65 km/h) | 64.54 mph (103.87 km/h) |
| 75 mph (120.7 km/h) | 69.15 mph (111.29 km/h) |
| 80 mph (128.75 km/h) | 73.76 mph (118.71 km/h) |
| 85 mph (136.79 km/h) | 78.37 mph (126.13 km/h) |
| 90 mph (144.84 km/h) | 82.99 mph (133.55 km/h) |
| 95 mph (152.89 km/h) | 87.6 mph (140.97 km/h) |
| 100 mph (160.93 km/h) | 92.21 mph (148.39 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1971 | 2290 | 2466 | 2575 | 2693 | 2777 | 2869 | 2978 | 3129 | 3280 | 3448 | 3582 | 3825 | 4094 | 4303 | 4438 | 4513 | 4790 | 5176 | 6015 |
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