Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 305/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 37.21 (945.2) | 9.29 (236) 33.3% |
| Width inches (mm) | 7.09 (180) | 12.01 (305) | 4.92 (125) 69.4% |
| Circum. inches (mm) | 87.72 (2228.02) | 116.91 (2969.43) | 29.19 (741.42) 33.3% |
| Sidewall Height inches (mm) | 4.96 (126) | 9.61 (244) | 4.65 (118) 93.7% |
| Revolutions per mile (km) | 722.32 (448.83) | 541.97 (336.76) | -180.35 (-112.06) -25% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 26.66 mph (42.9 km/h) |
| 25 mph (40.23 km/h) | 33.32 mph (53.62 km/h) |
| 30 mph (48.28 km/h) | 39.98 mph (64.35 km/h) |
| 35 mph (56.33 km/h) | 46.65 mph (75.07 km/h) |
| 40 mph (64.37 km/h) | 53.31 mph (85.8 km/h) |
| 45 mph (72.42 km/h) | 59.97 mph (96.52 km/h) |
| 50 mph (80.47 km/h) | 66.64 mph (107.24 km/h) |
| 55 mph (88.51 km/h) | 73.3 mph (117.97 km/h) |
| 60 mph (96.56 km/h) | 79.97 mph (128.69 km/h) |
| 65 mph (104.61 km/h) | 86.63 mph (139.42 km/h) |
| 70 mph (112.65 km/h) | 93.29 mph (150.14 km/h) |
| 75 mph (120.7 km/h) | 99.96 mph (160.87 km/h) |
| 80 mph (128.75 km/h) | 106.62 mph (171.59 km/h) |
| 85 mph (136.79 km/h) | 113.29 mph (182.32 km/h) |
| 90 mph (144.84 km/h) | 119.95 mph (193.04 km/h) |
| 95 mph (152.89 km/h) | 126.61 mph (203.76 km/h) |
| 100 mph (160.93 km/h) | 133.28 mph (214.49 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1379 | 1602 | 1725 | 1802 | 1884 | 1943 | 2007 | 2083 | 2189 | 2295 | 2412 | 2506 | 2676 | 2864 | 3011 | 3105 | 3158 | 3351 | 3621 | 4208 |
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