Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/40-21 | 315/35-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.66 (753.4) | 29.68 (753.9) | 0.02 (0.5) 0.1% |
| Width inches (mm) | 10.83 (275) | 12.4 (315) | 1.57 (40) 14.5% |
| Circum. inches (mm) | 93.18 (2366.88) | 93.25 (2368.45) | 0.06 (1.57) 0.1% |
| Sidewall Height inches (mm) | 4.33 (110) | 4.34 (110.25) | 0.01 (0.25) 0.2% |
| Revolutions per mile (km) | 679.94 (422.5) | 679.49 (422.22) | -0.45 (-0.28) -0.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.01 mph (32.21 km/h) |
| 25 mph (40.23 km/h) | 25.02 mph (40.26 km/h) |
| 30 mph (48.28 km/h) | 30.02 mph (48.31 km/h) |
| 35 mph (56.33 km/h) | 35.02 mph (56.36 km/h) |
| 40 mph (64.37 km/h) | 40.03 mph (64.42 km/h) |
| 45 mph (72.42 km/h) | 45.03 mph (72.47 km/h) |
| 50 mph (80.47 km/h) | 50.03 mph (80.52 km/h) |
| 55 mph (88.51 km/h) | 55.04 mph (88.57 km/h) |
| 60 mph (96.56 km/h) | 60.04 mph (96.62 km/h) |
| 65 mph (104.61 km/h) | 65.04 mph (104.68 km/h) |
| 70 mph (112.65 km/h) | 70.05 mph (112.73 km/h) |
| 75 mph (120.7 km/h) | 75.05 mph (120.78 km/h) |
| 80 mph (128.75 km/h) | 80.05 mph (128.83 km/h) |
| 85 mph (136.79 km/h) | 85.06 mph (136.89 km/h) |
| 90 mph (144.84 km/h) | 90.06 mph (144.94 km/h) |
| 95 mph (152.89 km/h) | 95.06 mph (152.99 km/h) |
| 100 mph (160.93 km/h) | 100.07 mph (161.04 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
