Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/60-20 | 305/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.88 (886) | 33.21 (843.5) | -1.67 (-42.5) -4.8% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 109.58 (2783.45) | 104.33 (2649.93) | -5.26 (-133.52) -4.8% |
| Sidewall Height inches (mm) | 7.44 (189) | 6.6 (167.75) | -0.84 (-21.25) -11.2% |
| Revolutions per mile (km) | 578.18 (359.27) | 607.31 (377.37) | 29.13 (18.1) 5% |
305/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.04 mph (30.64 km/h) |
| 25 mph (40.23 km/h) | 23.8 mph (38.3 km/h) |
| 30 mph (48.28 km/h) | 28.56 mph (45.96 km/h) |
| 35 mph (56.33 km/h) | 33.32 mph (53.63 km/h) |
| 40 mph (64.37 km/h) | 38.08 mph (61.29 km/h) |
| 45 mph (72.42 km/h) | 42.84 mph (68.95 km/h) |
| 50 mph (80.47 km/h) | 47.6 mph (76.61 km/h) |
| 55 mph (88.51 km/h) | 52.36 mph (84.27 km/h) |
| 60 mph (96.56 km/h) | 57.12 mph (91.93 km/h) |
| 65 mph (104.61 km/h) | 61.88 mph (99.59 km/h) |
| 70 mph (112.65 km/h) | 66.64 mph (107.25 km/h) |
| 75 mph (120.7 km/h) | 71.4 mph (114.91 km/h) |
| 80 mph (128.75 km/h) | 76.16 mph (122.57 km/h) |
| 85 mph (136.79 km/h) | 80.92 mph (130.23 km/h) |
| 90 mph (144.84 km/h) | 85.68 mph (137.89 km/h) |
| 95 mph (152.89 km/h) | 90.44 mph (145.55 km/h) |
| 100 mph (160.93 km/h) | 95.2 mph (153.21 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1546 | 1795 | 1934 | 2019 | 2111 | 2177 | 2249 | 2335 | 2453 | 2571 | 2703 | 2808 | 2999 | 3209 | 3374 | 3479 | 3538 | 3755 | 4058 | 4715 |
Better Fuel Economy Factory Ratios Increased Power
