Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 305/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 29.61 (752) | -3 (-76.2) -9.2% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 102.44 (2601.87) | 93.01 (2362.48) | -9.42 (-239.39) -9.2% |
| Sidewall Height inches (mm) | 4.8 (122) | 4.8 (122) | 0 (0) 0% |
| Revolutions per mile (km) | 618.53 (384.34) | 681.21 (423.28) | 62.68 (38.94) 10.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.16 mph (29.23 km/h) |
| 25 mph (40.23 km/h) | 22.7 mph (36.53 km/h) |
| 30 mph (48.28 km/h) | 27.24 mph (43.84 km/h) |
| 35 mph (56.33 km/h) | 31.78 mph (51.14 km/h) |
| 40 mph (64.37 km/h) | 36.32 mph (58.45 km/h) |
| 45 mph (72.42 km/h) | 40.86 mph (65.76 km/h) |
| 50 mph (80.47 km/h) | 45.4 mph (73.06 km/h) |
| 55 mph (88.51 km/h) | 49.94 mph (80.37 km/h) |
| 60 mph (96.56 km/h) | 54.48 mph (87.68 km/h) |
| 65 mph (104.61 km/h) | 59.02 mph (94.98 km/h) |
| 70 mph (112.65 km/h) | 63.56 mph (102.29 km/h) |
| 75 mph (120.7 km/h) | 68.1 mph (109.6 km/h) |
| 80 mph (128.75 km/h) | 72.64 mph (116.9 km/h) |
| 85 mph (136.79 km/h) | 77.18 mph (124.21 km/h) |
| 90 mph (144.84 km/h) | 81.72 mph (131.51 km/h) |
| 95 mph (152.89 km/h) | 86.26 mph (138.82 km/h) |
| 100 mph (160.93 km/h) | 90.8 mph (146.13 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1734 | 2014 | 2169 | 2265 | 2368 | 2442 | 2523 | 2619 | 2752 | 2884 | 3032 | 3150 | 3364 | 3600 | 3784 | 3902 | 3969 | 4212 | 4551 | 5289 |
Better Fuel Economy Factory Ratios Increased Power
