Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/30-21 | 275/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.97 (710.4) | 30.74 (780.9) | 2.78 (70.5) 9.9% |
| Width inches (mm) | 11.61 (295) | 10.83 (275) | -0.79 (-20) -6.8% |
| Circum. inches (mm) | 87.87 (2231.79) | 96.59 (2453.27) | 8.72 (221.48) 9.9% |
| Sidewall Height inches (mm) | 3.48 (88.5) | 4.87 (123.75) | 1.39 (35.25) 39.8% |
| Revolutions per mile (km) | 721.1 (448.07) | 656 (407.62) | -65.1 (-40.45) -9% |
275/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.98 mph (35.38 km/h) |
| 25 mph (40.23 km/h) | 27.48 mph (44.23 km/h) |
| 30 mph (48.28 km/h) | 32.98 mph (53.07 km/h) |
| 35 mph (56.33 km/h) | 38.47 mph (61.92 km/h) |
| 40 mph (64.37 km/h) | 43.97 mph (70.76 km/h) |
| 45 mph (72.42 km/h) | 49.47 mph (79.61 km/h) |
| 50 mph (80.47 km/h) | 54.96 mph (88.45 km/h) |
| 55 mph (88.51 km/h) | 60.46 mph (97.3 km/h) |
| 60 mph (96.56 km/h) | 65.95 mph (106.14 km/h) |
| 65 mph (104.61 km/h) | 71.45 mph (114.99 km/h) |
| 70 mph (112.65 km/h) | 76.95 mph (123.83 km/h) |
| 75 mph (120.7 km/h) | 82.44 mph (132.68 km/h) |
| 80 mph (128.75 km/h) | 87.94 mph (141.52 km/h) |
| 85 mph (136.79 km/h) | 93.44 mph (150.37 km/h) |
| 90 mph (144.84 km/h) | 98.93 mph (159.22 km/h) |
| 95 mph (152.89 km/h) | 104.43 mph (168.06 km/h) |
| 100 mph (160.93 km/h) | 109.92 mph (176.91 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1669 | 1939 | 2089 | 2181 | 2280 | 2351 | 2430 | 2522 | 2650 | 2778 | 2920 | 3033 | 3239 | 3467 | 3644 | 3758 | 3822 | 4056 | 4383 | 5093 |
Better Fuel Economy Factory Ratios Increased Power
