Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-21 | 245/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.2 (716.4) | 26.75 (679.5) | -1.45 (-36.9) -5.2% |
| Width inches (mm) | 12.01 (305) | 9.65 (245) | -2.36 (-60) -19.7% |
| Circum. inches (mm) | 88.61 (2250.64) | 84.04 (2134.71) | -4.56 (-115.92) -5.2% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 3.38 (85.75) | -0.23 (-5.75) -6.3% |
| Revolutions per mile (km) | 715.06 (444.32) | 753.89 (468.45) | 38.83 (24.13) 5.4% |
245/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.97 mph (30.53 km/h) |
| 25 mph (40.23 km/h) | 23.71 mph (38.16 km/h) |
| 30 mph (48.28 km/h) | 28.45 mph (45.79 km/h) |
| 35 mph (56.33 km/h) | 33.2 mph (53.43 km/h) |
| 40 mph (64.37 km/h) | 37.94 mph (61.06 km/h) |
| 45 mph (72.42 km/h) | 42.68 mph (68.69 km/h) |
| 50 mph (80.47 km/h) | 47.42 mph (76.32 km/h) |
| 55 mph (88.51 km/h) | 52.17 mph (83.95 km/h) |
| 60 mph (96.56 km/h) | 56.91 mph (91.59 km/h) |
| 65 mph (104.61 km/h) | 61.65 mph (99.22 km/h) |
| 70 mph (112.65 km/h) | 66.39 mph (106.85 km/h) |
| 75 mph (120.7 km/h) | 71.14 mph (114.48 km/h) |
| 80 mph (128.75 km/h) | 75.88 mph (122.12 km/h) |
| 85 mph (136.79 km/h) | 80.62 mph (129.75 km/h) |
| 90 mph (144.84 km/h) | 85.36 mph (137.38 km/h) |
| 95 mph (152.89 km/h) | 90.11 mph (145.01 km/h) |
| 100 mph (160.93 km/h) | 94.85 mph (152.65 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1919 | 2229 | 2400 | 2506 | 2621 | 2702 | 2792 | 2898 | 3045 | 3192 | 3355 | 3486 | 3723 | 3984 | 4188 | 4319 | 4392 | 4662 | 5037 | 5854 |
Better Fuel Economy Factory Ratios Increased Power
