Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/45-20 | 35/12.5-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.81 (782.5) | 35.02 (889.6) | 4.22 (107.1) 13.7% |
| Width inches (mm) | 12.01 (305) | 12.52 (318) | 0.51 (13) 4.3% |
| Circum. inches (mm) | 96.78 (2458.3) | 110.03 (2794.76) | 13.25 (336.46) 13.7% |
| Sidewall Height inches (mm) | 5.4 (137.25) | 7.51 (190.8) | 2.11 (53.55) 39% |
| Revolutions per mile (km) | 654.66 (406.79) | 575.84 (357.81) | -78.82 (-48.97) -12% |
35/12.5-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.74 mph (36.59 km/h) |
| 25 mph (40.23 km/h) | 28.42 mph (45.74 km/h) |
| 30 mph (48.28 km/h) | 34.11 mph (54.89 km/h) |
| 35 mph (56.33 km/h) | 39.79 mph (64.04 km/h) |
| 40 mph (64.37 km/h) | 45.47 mph (73.18 km/h) |
| 45 mph (72.42 km/h) | 51.16 mph (82.33 km/h) |
| 50 mph (80.47 km/h) | 56.84 mph (91.48 km/h) |
| 55 mph (88.51 km/h) | 62.53 mph (100.63 km/h) |
| 60 mph (96.56 km/h) | 68.21 mph (109.78 km/h) |
| 65 mph (104.61 km/h) | 73.9 mph (118.93 km/h) |
| 70 mph (112.65 km/h) | 79.58 mph (128.07 km/h) |
| 75 mph (120.7 km/h) | 85.27 mph (137.22 km/h) |
| 80 mph (128.75 km/h) | 90.95 mph (146.37 km/h) |
| 85 mph (136.79 km/h) | 96.63 mph (155.52 km/h) |
| 90 mph (144.84 km/h) | 102.32 mph (164.67 km/h) |
| 95 mph (152.89 km/h) | 108 mph (173.81 km/h) |
| 100 mph (160.93 km/h) | 113.69 mph (182.96 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1465 | 1702 | 1833 | 1914 | 2002 | 2064 | 2133 | 2214 | 2326 | 2438 | 2563 | 2663 | 2844 | 3043 | 3199 | 3299 | 3355 | 3561 | 3847 | 4471 |
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