Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 180/65-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 24.21 (615) | -3.26 (-82.7) -11.9% |
| Width inches (mm) | 7.28 (185) | 7.09 (180) | -0.2 (-5) -2.7% |
| Circum. inches (mm) | 86.29 (2191.89) | 76.07 (1932.08) | -10.23 (-259.81) -11.9% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 4.61 (117) | -0.13 (-3.25) -2.7% |
| Revolutions per mile (km) | 734.23 (456.23) | 832.96 (517.58) | 98.73 (61.35) 13.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.63 mph (28.37 km/h) |
| 25 mph (40.23 km/h) | 22.04 mph (35.46 km/h) |
| 30 mph (48.28 km/h) | 26.44 mph (42.56 km/h) |
| 35 mph (56.33 km/h) | 30.85 mph (49.65 km/h) |
| 40 mph (64.37 km/h) | 35.26 mph (56.74 km/h) |
| 45 mph (72.42 km/h) | 39.67 mph (63.84 km/h) |
| 50 mph (80.47 km/h) | 44.07 mph (70.93 km/h) |
| 55 mph (88.51 km/h) | 48.48 mph (78.02 km/h) |
| 60 mph (96.56 km/h) | 52.89 mph (85.12 km/h) |
| 65 mph (104.61 km/h) | 57.3 mph (92.21 km/h) |
| 70 mph (112.65 km/h) | 61.7 mph (99.3 km/h) |
| 75 mph (120.7 km/h) | 66.11 mph (106.39 km/h) |
| 80 mph (128.75 km/h) | 70.52 mph (113.49 km/h) |
| 85 mph (136.79 km/h) | 74.92 mph (120.58 km/h) |
| 90 mph (144.84 km/h) | 79.33 mph (127.67 km/h) |
| 95 mph (152.89 km/h) | 83.74 mph (134.77 km/h) |
| 100 mph (160.93 km/h) | 88.15 mph (141.86 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2120 | 2462 | 2652 | 2769 | 2895 | 2986 | 3085 | 3202 | 3364 | 3527 | 3707 | 3852 | 4113 | 4402 | 4627 | 4772 | 4853 | 5150 | 5565 | 6467 |
Better Fuel Economy Factory Ratios Increased Power
