Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/30-30 | 305/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 37.44 (951) | 28.41 (721.5) | -9.04 (-229.5) -24.1% |
| Width inches (mm) | 12.4 (315) | 12.01 (305) | -0.39 (-10) -3.2% |
| Circum. inches (mm) | 117.62 (2987.65) | 89.24 (2266.66) | -28.39 (-721) -24.1% |
| Sidewall Height inches (mm) | 3.72 (94.5) | 4.2 (106.75) | 0.48 (12.25) 13% |
| Revolutions per mile (km) | 538.66 (334.71) | 710.01 (441.18) | 171.34 (106.47) 31.8% |
305/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 15.17 mph (24.42 km/h) |
| 25 mph (40.23 km/h) | 18.97 mph (30.52 km/h) |
| 30 mph (48.28 km/h) | 22.76 mph (36.63 km/h) |
| 35 mph (56.33 km/h) | 26.55 mph (42.73 km/h) |
| 40 mph (64.37 km/h) | 30.35 mph (48.84 km/h) |
| 45 mph (72.42 km/h) | 34.14 mph (54.94 km/h) |
| 50 mph (80.47 km/h) | 37.93 mph (61.05 km/h) |
| 55 mph (88.51 km/h) | 41.73 mph (67.15 km/h) |
| 60 mph (96.56 km/h) | 45.52 mph (73.26 km/h) |
| 65 mph (104.61 km/h) | 49.31 mph (79.36 km/h) |
| 70 mph (112.65 km/h) | 53.11 mph (85.47 km/h) |
| 75 mph (120.7 km/h) | 56.9 mph (91.57 km/h) |
| 80 mph (128.75 km/h) | 60.69 mph (97.68 km/h) |
| 85 mph (136.79 km/h) | 64.49 mph (103.78 km/h) |
| 90 mph (144.84 km/h) | 68.28 mph (109.89 km/h) |
| 95 mph (152.89 km/h) | 72.07 mph (115.99 km/h) |
| 100 mph (160.93 km/h) | 75.87 mph (122.1 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1807 | 2099 | 2260 | 2360 | 2468 | 2545 | 2630 | 2729 | 2868 | 3006 | 3160 | 3283 | 3506 | 3752 | 3944 | 4067 | 4136 | 4390 | 4744 | 5513 |
Better Fuel Economy Factory Ratios Increased Power
