Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-18 | 305/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.44 (646.2) | 25.2 (640.2) | -0.24 (-6) -0.9% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 79.93 (2030.1) | 79.18 (2011.25) | -0.74 (-18.85) -0.9% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 3.6 (91.5) | -0.12 (-3) -3.2% |
| Revolutions per mile (km) | 792.74 (492.59) | 800.17 (497.2) | 7.43 (4.62) 0.9% |
305/30-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.81 mph (31.89 km/h) |
| 25 mph (40.23 km/h) | 24.77 mph (39.86 km/h) |
| 30 mph (48.28 km/h) | 29.72 mph (47.83 km/h) |
| 35 mph (56.33 km/h) | 34.68 mph (55.8 km/h) |
| 40 mph (64.37 km/h) | 39.63 mph (63.78 km/h) |
| 45 mph (72.42 km/h) | 44.58 mph (71.75 km/h) |
| 50 mph (80.47 km/h) | 49.54 mph (79.72 km/h) |
| 55 mph (88.51 km/h) | 54.49 mph (87.69 km/h) |
| 60 mph (96.56 km/h) | 59.44 mph (95.66 km/h) |
| 65 mph (104.61 km/h) | 64.4 mph (103.64 km/h) |
| 70 mph (112.65 km/h) | 69.35 mph (111.61 km/h) |
| 75 mph (120.7 km/h) | 74.3 mph (119.58 km/h) |
| 80 mph (128.75 km/h) | 79.26 mph (127.55 km/h) |
| 85 mph (136.79 km/h) | 84.21 mph (135.52 km/h) |
| 90 mph (144.84 km/h) | 89.16 mph (143.5 km/h) |
| 95 mph (152.89 km/h) | 94.12 mph (151.47 km/h) |
| 100 mph (160.93 km/h) | 99.07 mph (159.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2036 | 2366 | 2548 | 2660 | 2781 | 2868 | 2963 | 3076 | 3232 | 3388 | 3561 | 3700 | 3951 | 4229 | 4445 | 4584 | 4662 | 4948 | 5346 | 6213 |
Better Fuel Economy Factory Ratios Increased Power
