Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 175/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 27.65 (702.2) | -0.73 (-18.5) -2.6% |
| Width inches (mm) | 6.1 (155) | 6.89 (175) | 0.79 (20) 12.9% |
| Circum. inches (mm) | 89.14 (2264.15) | 86.85 (2206.03) | -2.29 (-58.12) -2.6% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 4.82 (122.5) | -0.36 (-9.25) -7% |
| Revolutions per mile (km) | 710.8 (441.67) | 729.52 (453.3) | 18.73 (11.64) 2.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.49 mph (31.36 km/h) |
| 25 mph (40.23 km/h) | 24.36 mph (39.2 km/h) |
| 30 mph (48.28 km/h) | 29.23 mph (47.04 km/h) |
| 35 mph (56.33 km/h) | 34.1 mph (54.88 km/h) |
| 40 mph (64.37 km/h) | 38.97 mph (62.72 km/h) |
| 45 mph (72.42 km/h) | 43.84 mph (70.56 km/h) |
| 50 mph (80.47 km/h) | 48.72 mph (78.4 km/h) |
| 55 mph (88.51 km/h) | 53.59 mph (86.24 km/h) |
| 60 mph (96.56 km/h) | 58.46 mph (94.08 km/h) |
| 65 mph (104.61 km/h) | 63.33 mph (101.92 km/h) |
| 70 mph (112.65 km/h) | 68.2 mph (109.76 km/h) |
| 75 mph (120.7 km/h) | 73.07 mph (117.6 km/h) |
| 80 mph (128.75 km/h) | 77.95 mph (125.44 km/h) |
| 85 mph (136.79 km/h) | 82.82 mph (133.28 km/h) |
| 90 mph (144.84 km/h) | 87.69 mph (141.12 km/h) |
| 95 mph (152.89 km/h) | 92.56 mph (148.96 km/h) |
| 100 mph (160.93 km/h) | 97.43 mph (156.8 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1856 | 2157 | 2323 | 2425 | 2536 | 2615 | 2702 | 2804 | 2947 | 3089 | 3247 | 3373 | 3602 | 3855 | 4053 | 4179 | 4250 | 4511 | 4874 | 5664 |
Better Fuel Economy Factory Ratios Increased Power
