Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/30-21 | 296/30-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.02 (686.4) | 27.99 (711) | 0.97 (24.6) 3.6% |
| Width inches (mm) | 10.04 (255) | 11.65 (296) | 1.61 (41) 16.1% |
| Circum. inches (mm) | 84.9 (2156.39) | 87.94 (2233.67) | 3.04 (77.28) 3.6% |
| Sidewall Height inches (mm) | 3.01 (76.5) | 3.5 (88.8) | 0.48 (12.3) 16.1% |
| Revolutions per mile (km) | 746.31 (463.74) | 720.49 (447.69) | -25.82 (-16.04) -3.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.72 mph (33.34 km/h) |
| 25 mph (40.23 km/h) | 25.9 mph (41.68 km/h) |
| 30 mph (48.28 km/h) | 31.08 mph (50.01 km/h) |
| 35 mph (56.33 km/h) | 36.25 mph (58.35 km/h) |
| 40 mph (64.37 km/h) | 41.43 mph (66.68 km/h) |
| 45 mph (72.42 km/h) | 46.61 mph (75.02 km/h) |
| 50 mph (80.47 km/h) | 51.79 mph (83.35 km/h) |
| 55 mph (88.51 km/h) | 56.97 mph (91.69 km/h) |
| 60 mph (96.56 km/h) | 62.15 mph (100.02 km/h) |
| 65 mph (104.61 km/h) | 67.33 mph (108.36 km/h) |
| 70 mph (112.65 km/h) | 72.51 mph (116.69 km/h) |
| 75 mph (120.7 km/h) | 77.69 mph (125.03 km/h) |
| 80 mph (128.75 km/h) | 82.87 mph (133.36 km/h) |
| 85 mph (136.79 km/h) | 88.05 mph (141.7 km/h) |
| 90 mph (144.84 km/h) | 93.23 mph (150.03 km/h) |
| 95 mph (152.89 km/h) | 98.4 mph (158.37 km/h) |
| 100 mph (160.93 km/h) | 103.58 mph (166.7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1834 | 2130 | 2294 | 2395 | 2505 | 2583 | 2668 | 2770 | 2910 | 3051 | 3207 | 3332 | 3558 | 3807 | 4003 | 4127 | 4198 | 4455 | 4814 | 5594 |
Better Fuel Economy Factory Ratios Increased Power
