Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 34/12.5-18 | 275/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.03 (864.24) | 33.16 (842.2) | -0.87 (-22.04) -2.6% |
| Width inches (mm) | 12.52 (318) | 10.83 (275) | -1.69 (-43) -13.5% |
| Circum. inches (mm) | 106.89 (2715.09) | 104.17 (2645.85) | -2.73 (-69.24) -2.6% |
| Sidewall Height inches (mm) | 8.01 (203.52) | 7.58 (192.5) | -0.43 (-11.02) -5.4% |
| Revolutions per mile (km) | 592.74 (368.31) | 608.25 (377.95) | 15.51 (9.64) 2.6% |
275/70-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.49 mph (31.37 km/h) |
| 25 mph (40.23 km/h) | 24.36 mph (39.21 km/h) |
| 30 mph (48.28 km/h) | 29.23 mph (47.05 km/h) |
| 35 mph (56.33 km/h) | 34.11 mph (54.89 km/h) |
| 40 mph (64.37 km/h) | 38.98 mph (62.73 km/h) |
| 45 mph (72.42 km/h) | 43.85 mph (70.57 km/h) |
| 50 mph (80.47 km/h) | 48.72 mph (78.42 km/h) |
| 55 mph (88.51 km/h) | 53.6 mph (86.26 km/h) |
| 60 mph (96.56 km/h) | 58.47 mph (94.1 km/h) |
| 65 mph (104.61 km/h) | 63.34 mph (101.94 km/h) |
| 70 mph (112.65 km/h) | 68.21 mph (109.78 km/h) |
| 75 mph (120.7 km/h) | 73.09 mph (117.62 km/h) |
| 80 mph (128.75 km/h) | 77.96 mph (125.46 km/h) |
| 85 mph (136.79 km/h) | 82.83 mph (133.31 km/h) |
| 90 mph (144.84 km/h) | 87.7 mph (141.15 km/h) |
| 95 mph (152.89 km/h) | 92.58 mph (148.99 km/h) |
| 100 mph (160.93 km/h) | 97.45 mph (156.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1548 | 1798 | 1937 | 2022 | 2114 | 2180 | 2253 | 2338 | 2457 | 2575 | 2707 | 2813 | 3004 | 3214 | 3379 | 3484 | 3544 | 3761 | 4064 | 4723 |
Better Fuel Economy Factory Ratios Increased Power
