Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/25-19 | 275/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25 (635.1) | 26.66 (677.2) | 1.66 (42.1) 6.6% |
| Width inches (mm) | 12.01 (305) | 10.83 (275) | -1.18 (-30) -9.8% |
| Circum. inches (mm) | 78.55 (1995.23) | 83.76 (2127.49) | 5.21 (132.26) 6.6% |
| Sidewall Height inches (mm) | 3 (76.25) | 4.33 (110) | 1.33 (33.75) 44.3% |
| Revolutions per mile (km) | 806.6 (501.2) | 756.45 (470.04) | -50.14 (-31.16) -6.2% |
275/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.33 mph (34.32 km/h) |
| 25 mph (40.23 km/h) | 26.66 mph (42.9 km/h) |
| 30 mph (48.28 km/h) | 31.99 mph (51.48 km/h) |
| 35 mph (56.33 km/h) | 37.32 mph (60.06 km/h) |
| 40 mph (64.37 km/h) | 42.65 mph (68.64 km/h) |
| 45 mph (72.42 km/h) | 47.98 mph (77.22 km/h) |
| 50 mph (80.47 km/h) | 53.31 mph (85.8 km/h) |
| 55 mph (88.51 km/h) | 58.65 mph (94.38 km/h) |
| 60 mph (96.56 km/h) | 63.98 mph (102.96 km/h) |
| 65 mph (104.61 km/h) | 69.31 mph (111.54 km/h) |
| 70 mph (112.65 km/h) | 74.64 mph (120.12 km/h) |
| 75 mph (120.7 km/h) | 79.97 mph (128.7 km/h) |
| 80 mph (128.75 km/h) | 85.3 mph (137.28 km/h) |
| 85 mph (136.79 km/h) | 90.63 mph (145.86 km/h) |
| 90 mph (144.84 km/h) | 95.97 mph (154.44 km/h) |
| 95 mph (152.89 km/h) | 101.3 mph (163.02 km/h) |
| 100 mph (160.93 km/h) | 106.63 mph (171.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1925 | 2236 | 2408 | 2515 | 2630 | 2711 | 2802 | 2908 | 3055 | 3203 | 3367 | 3498 | 3735 | 3998 | 4202 | 4333 | 4407 | 4677 | 5054 | 5873 |
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