Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-20 | 31/16-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.61 (752) | 30.87 (784.08) | 1.26 (32.08) 4.3% |
| Width inches (mm) | 12.01 (305) | 15.98 (406) | 3.98 (101) 33.1% |
| Circum. inches (mm) | 93.01 (2362.48) | 96.98 (2463.26) | 3.97 (100.78) 4.3% |
| Sidewall Height inches (mm) | 4.8 (122) | 5.43 (138.04) | 0.63 (16.04) 13.1% |
| Revolutions per mile (km) | 681.21 (423.28) | 653.34 (405.97) | -27.87 (-17.32) -4.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.85 mph (33.56 km/h) |
| 25 mph (40.23 km/h) | 26.07 mph (41.95 km/h) |
| 30 mph (48.28 km/h) | 31.28 mph (50.34 km/h) |
| 35 mph (56.33 km/h) | 36.49 mph (58.73 km/h) |
| 40 mph (64.37 km/h) | 41.71 mph (67.12 km/h) |
| 45 mph (72.42 km/h) | 46.92 mph (75.51 km/h) |
| 50 mph (80.47 km/h) | 52.13 mph (83.9 km/h) |
| 55 mph (88.51 km/h) | 57.35 mph (92.29 km/h) |
| 60 mph (96.56 km/h) | 62.56 mph (100.68 km/h) |
| 65 mph (104.61 km/h) | 67.77 mph (109.07 km/h) |
| 70 mph (112.65 km/h) | 72.99 mph (117.46 km/h) |
| 75 mph (120.7 km/h) | 78.2 mph (125.85 km/h) |
| 80 mph (128.75 km/h) | 83.41 mph (134.24 km/h) |
| 85 mph (136.79 km/h) | 88.63 mph (142.63 km/h) |
| 90 mph (144.84 km/h) | 93.84 mph (151.02 km/h) |
| 95 mph (152.89 km/h) | 99.05 mph (159.41 km/h) |
| 100 mph (160.93 km/h) | 104.27 mph (167.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1663 | 1931 | 2080 | 2172 | 2271 | 2342 | 2420 | 2512 | 2639 | 2766 | 2908 | 3021 | 3226 | 3453 | 3629 | 3743 | 3806 | 4040 | 4365 | 5073 |
Better Fuel Economy Factory Ratios Increased Power
