Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 100/90-21 | 90/90-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.09 (713.4) | 27.38 (695.4) | -0.71 (-18) -2.5% |
| Width inches (mm) | 3.94 (100) | 3.54 (90) | -0.39 (-10) -10% |
| Circum. inches (mm) | 88.24 (2241.21) | 86.01 (2184.66) | -2.23 (-56.55) -2.5% |
| Sidewall Height inches (mm) | 3.54 (90) | 3.19 (81) | -0.35 (-9) -10% |
| Revolutions per mile (km) | 718.07 (446.19) | 736.66 (457.74) | 18.59 (11.55) 2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.5 mph (31.37 km/h) |
| 25 mph (40.23 km/h) | 24.37 mph (39.22 km/h) |
| 30 mph (48.28 km/h) | 29.24 mph (47.06 km/h) |
| 35 mph (56.33 km/h) | 34.12 mph (54.91 km/h) |
| 40 mph (64.37 km/h) | 38.99 mph (62.75 km/h) |
| 45 mph (72.42 km/h) | 43.86 mph (70.59 km/h) |
| 50 mph (80.47 km/h) | 48.74 mph (78.44 km/h) |
| 55 mph (88.51 km/h) | 53.61 mph (86.28 km/h) |
| 60 mph (96.56 km/h) | 58.49 mph (94.12 km/h) |
| 65 mph (104.61 km/h) | 63.36 mph (101.97 km/h) |
| 70 mph (112.65 km/h) | 68.23 mph (109.81 km/h) |
| 75 mph (120.7 km/h) | 73.11 mph (117.66 km/h) |
| 80 mph (128.75 km/h) | 77.98 mph (125.5 km/h) |
| 85 mph (136.79 km/h) | 82.86 mph (133.34 km/h) |
| 90 mph (144.84 km/h) | 87.73 mph (141.19 km/h) |
| 95 mph (152.89 km/h) | 92.6 mph (149.03 km/h) |
| 100 mph (160.93 km/h) | 97.48 mph (156.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1875 | 2178 | 2345 | 2449 | 2561 | 2640 | 2728 | 2832 | 2976 | 3119 | 3279 | 3406 | 3638 | 3893 | 4092 | 4220 | 4292 | 4555 | 4922 | 5720 |
Better Fuel Economy Factory Ratios Increased Power
