Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 185/65-18 | 185/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.47 (697.7) | 29.65 (753.2) | 2.19 (55.5) 8% |
| Width inches (mm) | 7.28 (185) | 7.28 (185) | 0 (0) 0% |
| Circum. inches (mm) | 86.29 (2191.89) | 93.16 (2366.25) | 6.86 (174.36) 8% |
| Sidewall Height inches (mm) | 4.73 (120.25) | 5.83 (148) | 1.09 (27.75) 23.1% |
| Revolutions per mile (km) | 734.23 (456.23) | 680.12 (422.61) | -54.1 (-33.62) -7.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.59 mph (34.75 km/h) |
| 25 mph (40.23 km/h) | 26.99 mph (43.43 km/h) |
| 30 mph (48.28 km/h) | 32.39 mph (52.12 km/h) |
| 35 mph (56.33 km/h) | 37.78 mph (60.81 km/h) |
| 40 mph (64.37 km/h) | 43.18 mph (69.49 km/h) |
| 45 mph (72.42 km/h) | 48.58 mph (78.18 km/h) |
| 50 mph (80.47 km/h) | 53.98 mph (86.87 km/h) |
| 55 mph (88.51 km/h) | 59.38 mph (95.56 km/h) |
| 60 mph (96.56 km/h) | 64.77 mph (104.24 km/h) |
| 65 mph (104.61 km/h) | 70.17 mph (112.93 km/h) |
| 70 mph (112.65 km/h) | 75.57 mph (121.62 km/h) |
| 75 mph (120.7 km/h) | 80.97 mph (130.3 km/h) |
| 80 mph (128.75 km/h) | 86.36 mph (138.99 km/h) |
| 85 mph (136.79 km/h) | 91.76 mph (147.68 km/h) |
| 90 mph (144.84 km/h) | 97.16 mph (156.36 km/h) |
| 95 mph (152.89 km/h) | 102.56 mph (165.05 km/h) |
| 100 mph (160.93 km/h) | 107.95 mph (173.74 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1731 | 2011 | 2165 | 2261 | 2364 | 2438 | 2519 | 2615 | 2747 | 2880 | 3027 | 3145 | 3358 | 3594 | 3778 | 3896 | 3962 | 4205 | 4544 | 5281 |
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