Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 315/65-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 37.12 (942.9) | 9.13 (232) 32.6% |
| Width inches (mm) | 13.98 (355) | 12.4 (315) | -1.57 (-40) -11.3% |
| Circum. inches (mm) | 87.93 (2233.36) | 116.62 (2962.21) | 28.69 (728.85) 32.6% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 8.06 (204.75) | 4.57 (116) 130.7% |
| Revolutions per mile (km) | 720.59 (447.76) | 543.29 (337.59) | -177.3 (-110.17) -24.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.53 mph (42.69 km/h) |
| 25 mph (40.23 km/h) | 33.16 mph (53.36 km/h) |
| 30 mph (48.28 km/h) | 39.79 mph (64.04 km/h) |
| 35 mph (56.33 km/h) | 46.42 mph (74.71 km/h) |
| 40 mph (64.37 km/h) | 53.05 mph (85.38 km/h) |
| 45 mph (72.42 km/h) | 59.69 mph (96.05 km/h) |
| 50 mph (80.47 km/h) | 66.32 mph (106.73 km/h) |
| 55 mph (88.51 km/h) | 72.95 mph (117.4 km/h) |
| 60 mph (96.56 km/h) | 79.58 mph (128.07 km/h) |
| 65 mph (104.61 km/h) | 86.21 mph (138.75 km/h) |
| 70 mph (112.65 km/h) | 92.84 mph (149.42 km/h) |
| 75 mph (120.7 km/h) | 99.48 mph (160.09 km/h) |
| 80 mph (128.75 km/h) | 106.11 mph (170.76 km/h) |
| 85 mph (136.79 km/h) | 112.74 mph (181.44 km/h) |
| 90 mph (144.84 km/h) | 119.37 mph (192.11 km/h) |
| 95 mph (152.89 km/h) | 126 mph (202.78 km/h) |
| 100 mph (160.93 km/h) | 132.63 mph (213.46 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1383 | 1606 | 1730 | 1806 | 1889 | 1947 | 2012 | 2089 | 2194 | 2300 | 2418 | 2512 | 2683 | 2871 | 3018 | 3112 | 3165 | 3359 | 3630 | 4218 |
Better Fuel Economy Factory Ratios Increased Power
