Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-21 | 235/50-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.04 (788.4) | 30.25 (768.4) | -0.79 (-20) -2.5% |
| Width inches (mm) | 10.04 (255) | 9.25 (235) | -0.79 (-20) -7.8% |
| Circum. inches (mm) | 97.51 (2476.83) | 95.04 (2414) | -2.47 (-62.83) -2.5% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 4.63 (117.5) | -0.39 (-10) -7.8% |
| Revolutions per mile (km) | 649.76 (403.74) | 666.67 (414.25) | 16.91 (10.51) 2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.49 mph (31.37 km/h) |
| 25 mph (40.23 km/h) | 24.37 mph (39.21 km/h) |
| 30 mph (48.28 km/h) | 29.24 mph (47.06 km/h) |
| 35 mph (56.33 km/h) | 34.11 mph (54.9 km/h) |
| 40 mph (64.37 km/h) | 38.99 mph (62.74 km/h) |
| 45 mph (72.42 km/h) | 43.86 mph (70.58 km/h) |
| 50 mph (80.47 km/h) | 48.73 mph (78.43 km/h) |
| 55 mph (88.51 km/h) | 53.6 mph (86.27 km/h) |
| 60 mph (96.56 km/h) | 58.48 mph (94.11 km/h) |
| 65 mph (104.61 km/h) | 63.35 mph (101.95 km/h) |
| 70 mph (112.65 km/h) | 68.22 mph (109.8 km/h) |
| 75 mph (120.7 km/h) | 73.1 mph (117.64 km/h) |
| 80 mph (128.75 km/h) | 77.97 mph (125.48 km/h) |
| 85 mph (136.79 km/h) | 82.84 mph (133.32 km/h) |
| 90 mph (144.84 km/h) | 87.72 mph (141.17 km/h) |
| 95 mph (152.89 km/h) | 92.59 mph (149.01 km/h) |
| 100 mph (160.93 km/h) | 97.46 mph (156.85 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1697 | 1971 | 2122 | 2216 | 2317 | 2390 | 2469 | 2563 | 2693 | 2823 | 2967 | 3083 | 3292 | 3523 | 3704 | 3819 | 3884 | 4122 | 4454 | 5176 |
Better Fuel Economy Factory Ratios Increased Power
