Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 265/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 30.39 (771.9) | 2.02 (51.2) 7.1% |
| Width inches (mm) | 6.1 (155) | 10.43 (265) | 4.33 (110) 71% |
| Circum. inches (mm) | 89.14 (2264.15) | 95.47 (2425) | 6.33 (160.85) 7.1% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 4.69 (119.25) | -0.49 (-12.5) -9.5% |
| Revolutions per mile (km) | 710.8 (441.67) | 663.65 (412.37) | -47.15 (-29.3) -6.6% |
265/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.42 mph (34.47 km/h) |
| 25 mph (40.23 km/h) | 26.78 mph (43.09 km/h) |
| 30 mph (48.28 km/h) | 32.13 mph (51.71 km/h) |
| 35 mph (56.33 km/h) | 37.49 mph (60.33 km/h) |
| 40 mph (64.37 km/h) | 42.84 mph (68.95 km/h) |
| 45 mph (72.42 km/h) | 48.2 mph (77.57 km/h) |
| 50 mph (80.47 km/h) | 53.55 mph (86.18 km/h) |
| 55 mph (88.51 km/h) | 58.91 mph (94.8 km/h) |
| 60 mph (96.56 km/h) | 64.26 mph (103.42 km/h) |
| 65 mph (104.61 km/h) | 69.62 mph (112.04 km/h) |
| 70 mph (112.65 km/h) | 74.97 mph (120.66 km/h) |
| 75 mph (120.7 km/h) | 80.33 mph (129.28 km/h) |
| 80 mph (128.75 km/h) | 85.68 mph (137.89 km/h) |
| 85 mph (136.79 km/h) | 91.04 mph (146.51 km/h) |
| 90 mph (144.84 km/h) | 96.39 mph (155.13 km/h) |
| 95 mph (152.89 km/h) | 101.75 mph (163.75 km/h) |
| 100 mph (160.93 km/h) | 107.1 mph (172.37 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1689 | 1962 | 2113 | 2206 | 2307 | 2379 | 2458 | 2551 | 2681 | 2810 | 2954 | 3069 | 3277 | 3507 | 3687 | 3802 | 3866 | 4104 | 4434 | 5153 |
Better Fuel Economy Factory Ratios Increased Power
