Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/65-17 | 305/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.54 (750.3) | 31.21 (792.7) | 1.67 (42.4) 5.7% |
| Width inches (mm) | 9.65 (245) | 12.01 (305) | 2.36 (60) 24.5% |
| Circum. inches (mm) | 92.8 (2357.14) | 98.04 (2490.34) | 5.24 (133.2) 5.7% |
| Sidewall Height inches (mm) | 6.27 (159.25) | 6.6 (167.75) | 0.33 (8.5) 5.3% |
| Revolutions per mile (km) | 682.75 (424.24) | 646.23 (401.55) | -36.52 (-22.69) -5.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.13 mph (34.01 km/h) |
| 25 mph (40.23 km/h) | 26.41 mph (42.51 km/h) |
| 30 mph (48.28 km/h) | 31.7 mph (51.01 km/h) |
| 35 mph (56.33 km/h) | 36.98 mph (59.51 km/h) |
| 40 mph (64.37 km/h) | 42.26 mph (68.01 km/h) |
| 45 mph (72.42 km/h) | 47.54 mph (76.51 km/h) |
| 50 mph (80.47 km/h) | 52.83 mph (85.01 km/h) |
| 55 mph (88.51 km/h) | 58.11 mph (93.52 km/h) |
| 60 mph (96.56 km/h) | 63.39 mph (102.02 km/h) |
| 65 mph (104.61 km/h) | 68.67 mph (110.52 km/h) |
| 70 mph (112.65 km/h) | 73.96 mph (119.02 km/h) |
| 75 mph (120.7 km/h) | 79.24 mph (127.52 km/h) |
| 80 mph (128.75 km/h) | 84.52 mph (136.02 km/h) |
| 85 mph (136.79 km/h) | 89.8 mph (144.52 km/h) |
| 90 mph (144.84 km/h) | 95.09 mph (153.03 km/h) |
| 95 mph (152.89 km/h) | 100.37 mph (161.53 km/h) |
| 100 mph (160.93 km/h) | 105.65 mph (170.03 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1645 | 1910 | 2057 | 2148 | 2246 | 2316 | 2393 | 2484 | 2610 | 2736 | 2876 | 2988 | 3191 | 3415 | 3590 | 3702 | 3765 | 3996 | 4318 | 5018 |
Better Fuel Economy Factory Ratios Increased Power
