Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 315/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 29.68 (753.9) | 2.42 (61.5) 8.9% |
| Width inches (mm) | 10.43 (265) | 12.4 (315) | 1.97 (50) 18.9% |
| Circum. inches (mm) | 85.64 (2175.24) | 93.25 (2368.45) | 7.61 (193.21) 8.9% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 4.34 (110.25) | 1.21 (30.75) 38.7% |
| Revolutions per mile (km) | 739.85 (459.72) | 679.49 (422.22) | -60.35 (-37.5) -8.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.78 mph (35.05 km/h) |
| 25 mph (40.23 km/h) | 27.22 mph (43.81 km/h) |
| 30 mph (48.28 km/h) | 32.66 mph (52.57 km/h) |
| 35 mph (56.33 km/h) | 38.11 mph (61.33 km/h) |
| 40 mph (64.37 km/h) | 43.55 mph (70.09 km/h) |
| 45 mph (72.42 km/h) | 49 mph (78.85 km/h) |
| 50 mph (80.47 km/h) | 54.44 mph (87.61 km/h) |
| 55 mph (88.51 km/h) | 59.89 mph (96.38 km/h) |
| 60 mph (96.56 km/h) | 65.33 mph (105.14 km/h) |
| 65 mph (104.61 km/h) | 70.77 mph (113.9 km/h) |
| 70 mph (112.65 km/h) | 76.22 mph (122.66 km/h) |
| 75 mph (120.7 km/h) | 81.66 mph (131.42 km/h) |
| 80 mph (128.75 km/h) | 87.11 mph (140.18 km/h) |
| 85 mph (136.79 km/h) | 92.55 mph (148.94 km/h) |
| 90 mph (144.84 km/h) | 97.99 mph (157.71 km/h) |
| 95 mph (152.89 km/h) | 103.44 mph (166.47 km/h) |
| 100 mph (160.93 km/h) | 108.88 mph (175.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1729 | 2009 | 2163 | 2259 | 2362 | 2436 | 2517 | 2612 | 2745 | 2877 | 3024 | 3142 | 3355 | 3591 | 3775 | 3892 | 3959 | 4202 | 4540 | 5276 |
Better Fuel Economy Factory Ratios Increased Power
