Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 185/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 22.37 (568.2) | -5.1 (-129.5) -18.6% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 86.29 (2191.89) | 70.28 (1785.05) | -16.02 (-406.84) -18.6% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 2.19 (55.5) | -2.55 (-64.75) -53.8% |
| Revolutions per mile (km) | 734.23 (456.23) | 901.57 (560.21) | 167.34 (103.98) 22.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 16.29 mph (26.21 km/h) |
| 25 mph (40.23 km/h) | 20.36 mph (32.77 km/h) |
| 30 mph (48.28 km/h) | 24.43 mph (39.32 km/h) |
| 35 mph (56.33 km/h) | 28.5 mph (45.87 km/h) |
| 40 mph (64.37 km/h) | 32.58 mph (52.43 km/h) |
| 45 mph (72.42 km/h) | 36.65 mph (58.98 km/h) |
| 50 mph (80.47 km/h) | 40.72 mph (65.53 km/h) |
| 55 mph (88.51 km/h) | 44.79 mph (72.09 km/h) |
| 60 mph (96.56 km/h) | 48.86 mph (78.64 km/h) |
| 65 mph (104.61 km/h) | 52.94 mph (85.19 km/h) |
| 70 mph (112.65 km/h) | 57.01 mph (91.74 km/h) |
| 75 mph (120.7 km/h) | 61.08 mph (98.3 km/h) |
| 80 mph (128.75 km/h) | 65.15 mph (104.85 km/h) |
| 85 mph (136.79 km/h) | 69.22 mph (111.4 km/h) |
| 90 mph (144.84 km/h) | 73.3 mph (117.96 km/h) |
| 95 mph (152.89 km/h) | 77.37 mph (124.51 km/h) |
| 100 mph (160.93 km/h) | 81.44 mph (131.06 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2294 | 2665 | 2870 | 2997 | 3134 | 3232 | 3339 | 3466 | 3642 | 3817 | 4013 | 4169 | 4452 | 4764 | 5008 | 5165 | 5253 | 5575 | 6024 | 7000 |
Better Fuel Economy Factory Ratios Increased Power
