Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-21 | 285/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.03 (737.4) | 28.85 (732.9) | -0.18 (-4.5) -0.6% |
| Width inches (mm) | 10.04 (255) | 11.22 (285) | 1.18 (30) 11.8% |
| Circum. inches (mm) | 91.21 (2316.61) | 90.65 (2302.47) | -0.56 (-14.14) -0.6% |
| Sidewall Height inches (mm) | 4.02 (102) | 3.93 (99.75) | -0.09 (-2.25) -2.2% |
| Revolutions per mile (km) | 694.7 (431.66) | 698.96 (434.31) | 4.27 (2.65) 0.6% |
285/35-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.88 mph (31.99 km/h) |
| 25 mph (40.23 km/h) | 24.85 mph (39.99 km/h) |
| 30 mph (48.28 km/h) | 29.82 mph (47.99 km/h) |
| 35 mph (56.33 km/h) | 34.79 mph (55.98 km/h) |
| 40 mph (64.37 km/h) | 39.76 mph (63.98 km/h) |
| 45 mph (72.42 km/h) | 44.73 mph (71.98 km/h) |
| 50 mph (80.47 km/h) | 49.69 mph (79.98 km/h) |
| 55 mph (88.51 km/h) | 54.66 mph (87.97 km/h) |
| 60 mph (96.56 km/h) | 59.63 mph (95.97 km/h) |
| 65 mph (104.61 km/h) | 64.6 mph (103.97 km/h) |
| 70 mph (112.65 km/h) | 69.57 mph (111.97 km/h) |
| 75 mph (120.7 km/h) | 74.54 mph (119.96 km/h) |
| 80 mph (128.75 km/h) | 79.51 mph (127.96 km/h) |
| 85 mph (136.79 km/h) | 84.48 mph (135.96 km/h) |
| 90 mph (144.84 km/h) | 89.45 mph (143.96 km/h) |
| 95 mph (152.89 km/h) | 94.42 mph (151.95 km/h) |
| 100 mph (160.93 km/h) | 99.39 mph (159.95 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1779 | 2066 | 2225 | 2324 | 2430 | 2505 | 2589 | 2687 | 2823 | 2960 | 3111 | 3232 | 3451 | 3694 | 3883 | 4004 | 4072 | 4322 | 4670 | 5427 |
Better Fuel Economy Factory Ratios Increased Power
