Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 155/76-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 21.28 (540.4) | -8.39 (-213) -28.3% |
| Width inches (mm) | 10.83 (275) | 6.1 (155) | -4.72 (-120) -43.6% |
| Circum. inches (mm) | 93.18 (2366.88) | 66.84 (1697.72) | -26.34 (-669.16) -28.3% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.64 (117.8) | 0.31 (7.8) 7.1% |
| Revolutions per mile (km) | 679.94 (422.5) | 947.95 (589.03) | 268 (166.53) 39.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 14.35 mph (23.09 km/h) |
| 25 mph (40.23 km/h) | 17.93 mph (28.86 km/h) |
| 30 mph (48.28 km/h) | 21.52 mph (34.63 km/h) |
| 35 mph (56.33 km/h) | 25.1 mph (40.4 km/h) |
| 40 mph (64.37 km/h) | 28.69 mph (46.17 km/h) |
| 45 mph (72.42 km/h) | 32.28 mph (51.95 km/h) |
| 50 mph (80.47 km/h) | 35.86 mph (57.72 km/h) |
| 55 mph (88.51 km/h) | 39.45 mph (63.49 km/h) |
| 60 mph (96.56 km/h) | 43.04 mph (69.26 km/h) |
| 65 mph (104.61 km/h) | 46.62 mph (75.03 km/h) |
| 70 mph (112.65 km/h) | 50.21 mph (80.8 km/h) |
| 75 mph (120.7 km/h) | 53.8 mph (86.58 km/h) |
| 80 mph (128.75 km/h) | 57.38 mph (92.35 km/h) |
| 85 mph (136.79 km/h) | 60.97 mph (98.12 km/h) |
| 90 mph (144.84 km/h) | 64.56 mph (103.89 km/h) |
| 95 mph (152.89 km/h) | 68.14 mph (109.66 km/h) |
| 100 mph (160.93 km/h) | 71.73 mph (115.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
