Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 270/70-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 34.88 (886) | 2.28 (57.8) 7% |
| Width inches (mm) | 12.01 (305) | 10.63 (270) | -1.38 (-35) -11.5% |
| Circum. inches (mm) | 102.44 (2601.87) | 109.58 (2783.45) | 7.15 (181.58) 7% |
| Sidewall Height inches (mm) | 4.8 (122) | 7.44 (189) | 2.64 (67) 54.9% |
| Revolutions per mile (km) | 618.53 (384.34) | 578.18 (359.27) | -40.35 (-25.07) -6.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.4 mph (34.43 km/h) |
| 25 mph (40.23 km/h) | 26.74 mph (43.04 km/h) |
| 30 mph (48.28 km/h) | 32.09 mph (51.65 km/h) |
| 35 mph (56.33 km/h) | 37.44 mph (60.26 km/h) |
| 40 mph (64.37 km/h) | 42.79 mph (68.87 km/h) |
| 45 mph (72.42 km/h) | 48.14 mph (77.47 km/h) |
| 50 mph (80.47 km/h) | 53.49 mph (86.08 km/h) |
| 55 mph (88.51 km/h) | 58.84 mph (94.69 km/h) |
| 60 mph (96.56 km/h) | 64.19 mph (103.3 km/h) |
| 65 mph (104.61 km/h) | 69.54 mph (111.91 km/h) |
| 70 mph (112.65 km/h) | 74.89 mph (120.52 km/h) |
| 75 mph (120.7 km/h) | 80.23 mph (129.12 km/h) |
| 80 mph (128.75 km/h) | 85.58 mph (137.73 km/h) |
| 85 mph (136.79 km/h) | 90.93 mph (146.34 km/h) |
| 90 mph (144.84 km/h) | 96.28 mph (154.95 km/h) |
| 95 mph (152.89 km/h) | 101.63 mph (163.56 km/h) |
| 100 mph (160.93 km/h) | 106.98 mph (172.17 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1471 | 1709 | 1841 | 1922 | 2010 | 2072 | 2141 | 2223 | 2335 | 2448 | 2573 | 2674 | 2855 | 3055 | 3212 | 3312 | 3368 | 3575 | 3863 | 4489 |
Better Fuel Economy Factory Ratios Increased Power
