Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 265/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 26.26 (667) | -0.53 (-13.4) -2% |
| Width inches (mm) | 9.65 (245) | 10.43 (265) | 0.79 (20) 8.2% |
| Circum. inches (mm) | 84.16 (2137.54) | 82.5 (2095.44) | -1.66 (-42.1) -2% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 3.13 (79.5) | 0.24 (6) 8.2% |
| Revolutions per mile (km) | 752.9 (467.83) | 768.02 (477.23) | 15.13 (9.4) 2% |
265/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.61 mph (31.55 km/h) |
| 25 mph (40.23 km/h) | 24.51 mph (39.44 km/h) |
| 30 mph (48.28 km/h) | 29.41 mph (47.33 km/h) |
| 35 mph (56.33 km/h) | 34.31 mph (55.22 km/h) |
| 40 mph (64.37 km/h) | 39.21 mph (63.11 km/h) |
| 45 mph (72.42 km/h) | 44.11 mph (70.99 km/h) |
| 50 mph (80.47 km/h) | 49.02 mph (78.88 km/h) |
| 55 mph (88.51 km/h) | 53.92 mph (86.77 km/h) |
| 60 mph (96.56 km/h) | 58.82 mph (94.66 km/h) |
| 65 mph (104.61 km/h) | 63.72 mph (102.55 km/h) |
| 70 mph (112.65 km/h) | 68.62 mph (110.44 km/h) |
| 75 mph (120.7 km/h) | 73.52 mph (118.32 km/h) |
| 80 mph (128.75 km/h) | 78.42 mph (126.21 km/h) |
| 85 mph (136.79 km/h) | 83.33 mph (134.1 km/h) |
| 90 mph (144.84 km/h) | 88.23 mph (141.99 km/h) |
| 95 mph (152.89 km/h) | 93.13 mph (149.88 km/h) |
| 100 mph (160.93 km/h) | 98.03 mph (157.77 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1954 | 2271 | 2445 | 2553 | 2670 | 2753 | 2844 | 2952 | 3102 | 3252 | 3418 | 3551 | 3792 | 4059 | 4267 | 4400 | 4474 | 4749 | 5132 | 5963 |
Better Fuel Economy Factory Ratios Increased Power
