Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/30-21 | 285/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.5 (698.4) | 29.98 (761.4) | 2.48 (63) 9% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 86.38 (2194.09) | 94.17 (2392.01) | 7.79 (197.92) 9% |
| Sidewall Height inches (mm) | 3.25 (82.5) | 4.49 (114) | 1.24 (31.5) 38.2% |
| Revolutions per mile (km) | 733.49 (455.77) | 672.8 (418.06) | -60.69 (-37.71) -8.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.8 mph (35.09 km/h) |
| 25 mph (40.23 km/h) | 27.26 mph (43.86 km/h) |
| 30 mph (48.28 km/h) | 32.71 mph (52.64 km/h) |
| 35 mph (56.33 km/h) | 38.16 mph (61.41 km/h) |
| 40 mph (64.37 km/h) | 43.61 mph (70.18 km/h) |
| 45 mph (72.42 km/h) | 49.06 mph (78.95 km/h) |
| 50 mph (80.47 km/h) | 54.51 mph (87.73 km/h) |
| 55 mph (88.51 km/h) | 59.96 mph (96.5 km/h) |
| 60 mph (96.56 km/h) | 65.41 mph (105.27 km/h) |
| 65 mph (104.61 km/h) | 70.86 mph (114.04 km/h) |
| 70 mph (112.65 km/h) | 76.31 mph (122.82 km/h) |
| 75 mph (120.7 km/h) | 81.77 mph (131.59 km/h) |
| 80 mph (128.75 km/h) | 87.22 mph (140.36 km/h) |
| 85 mph (136.79 km/h) | 92.67 mph (149.13 km/h) |
| 90 mph (144.84 km/h) | 98.12 mph (157.91 km/h) |
| 95 mph (152.89 km/h) | 103.57 mph (166.68 km/h) |
| 100 mph (160.93 km/h) | 109.02 mph (175.45 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1712 | 1989 | 2142 | 2237 | 2339 | 2412 | 2492 | 2586 | 2718 | 2849 | 2994 | 3111 | 3322 | 3555 | 3738 | 3854 | 3920 | 4160 | 4495 | 5224 |
Better Fuel Economy Factory Ratios Increased Power
