Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-12 | 145/70-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 20.5 (520.8) | 19.99 (507.8) | -0.51 (-13) -2.5% |
| Width inches (mm) | 5.31 (135) | 5.71 (145) | 0.39 (10) 7.4% |
| Circum. inches (mm) | 64.42 (1636.14) | 62.81 (1595.3) | -1.61 (-40.84) -2.5% |
| Sidewall Height inches (mm) | 4.25 (108) | 4 (101.5) | -0.26 (-6.5) -6% |
| Revolutions per mile (km) | 983.62 (611.19) | 1008.8 (626.84) | 25.18 (15.65) 2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.5 mph (31.38 km/h) |
| 25 mph (40.23 km/h) | 24.38 mph (39.23 km/h) |
| 30 mph (48.28 km/h) | 29.25 mph (47.08 km/h) |
| 35 mph (56.33 km/h) | 34.13 mph (54.92 km/h) |
| 40 mph (64.37 km/h) | 39 mph (62.77 km/h) |
| 45 mph (72.42 km/h) | 43.88 mph (70.61 km/h) |
| 50 mph (80.47 km/h) | 48.75 mph (78.46 km/h) |
| 55 mph (88.51 km/h) | 53.63 mph (86.3 km/h) |
| 60 mph (96.56 km/h) | 58.5 mph (94.15 km/h) |
| 65 mph (104.61 km/h) | 63.38 mph (102 km/h) |
| 70 mph (112.65 km/h) | 68.25 mph (109.84 km/h) |
| 75 mph (120.7 km/h) | 73.13 mph (117.69 km/h) |
| 80 mph (128.75 km/h) | 78 mph (125.53 km/h) |
| 85 mph (136.79 km/h) | 82.88 mph (133.38 km/h) |
| 90 mph (144.84 km/h) | 87.75 mph (141.23 km/h) |
| 95 mph (152.89 km/h) | 92.63 mph (149.07 km/h) |
| 100 mph (160.93 km/h) | 97.5 mph (156.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
