Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 305/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 33.81 (858.8) | 3.41 (86.6) 11.2% |
| Width inches (mm) | 6.89 (175) | 12.01 (305) | 5.12 (130) 74.3% |
| Circum. inches (mm) | 95.51 (2425.94) | 106.22 (2698) | 10.71 (272.06) 11.2% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 8.41 (213.5) | 2.2 (56) 35.6% |
| Revolutions per mile (km) | 663.39 (412.21) | 596.5 (370.64) | -66.9 (-41.57) -10.1% |
305/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.24 mph (35.8 km/h) |
| 25 mph (40.23 km/h) | 27.8 mph (44.75 km/h) |
| 30 mph (48.28 km/h) | 33.36 mph (53.69 km/h) |
| 35 mph (56.33 km/h) | 38.93 mph (62.64 km/h) |
| 40 mph (64.37 km/h) | 44.49 mph (71.59 km/h) |
| 45 mph (72.42 km/h) | 50.05 mph (80.54 km/h) |
| 50 mph (80.47 km/h) | 55.61 mph (89.49 km/h) |
| 55 mph (88.51 km/h) | 61.17 mph (98.44 km/h) |
| 60 mph (96.56 km/h) | 66.73 mph (107.39 km/h) |
| 65 mph (104.61 km/h) | 72.29 mph (116.34 km/h) |
| 70 mph (112.65 km/h) | 77.85 mph (125.29 km/h) |
| 75 mph (120.7 km/h) | 83.41 mph (134.24 km/h) |
| 80 mph (128.75 km/h) | 88.97 mph (143.19 km/h) |
| 85 mph (136.79 km/h) | 94.53 mph (152.14 km/h) |
| 90 mph (144.84 km/h) | 100.09 mph (161.08 km/h) |
| 95 mph (152.89 km/h) | 105.65 mph (170.03 km/h) |
| 100 mph (160.93 km/h) | 111.21 mph (178.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1518 | 1763 | 1899 | 1983 | 2073 | 2138 | 2209 | 2293 | 2409 | 2526 | 2655 | 2758 | 2946 | 3152 | 3314 | 3417 | 3475 | 3688 | 3985 | 4631 |
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