Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/80-16 | 245/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.87 (606.4) | 25.72 (653.2) | 1.84 (46.8) 7.7% |
| Width inches (mm) | 4.92 (125) | 9.65 (245) | 4.72 (120) 96% |
| Circum. inches (mm) | 75 (1905.06) | 80.79 (2052.09) | 5.79 (147.03) 7.7% |
| Sidewall Height inches (mm) | 3.94 (100) | 3.86 (98) | -0.08 (-2) -2% |
| Revolutions per mile (km) | 844.77 (524.92) | 784.25 (487.31) | -60.53 (-37.61) -7.2% |
245/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.54 mph (34.67 km/h) |
| 25 mph (40.23 km/h) | 26.93 mph (43.34 km/h) |
| 30 mph (48.28 km/h) | 32.32 mph (52.01 km/h) |
| 35 mph (56.33 km/h) | 37.7 mph (60.67 km/h) |
| 40 mph (64.37 km/h) | 43.09 mph (69.34 km/h) |
| 45 mph (72.42 km/h) | 48.47 mph (78.01 km/h) |
| 50 mph (80.47 km/h) | 53.86 mph (86.68 km/h) |
| 55 mph (88.51 km/h) | 59.24 mph (95.35 km/h) |
| 60 mph (96.56 km/h) | 64.63 mph (104.01 km/h) |
| 65 mph (104.61 km/h) | 70.02 mph (112.68 km/h) |
| 70 mph (112.65 km/h) | 75.4 mph (121.35 km/h) |
| 75 mph (120.7 km/h) | 80.79 mph (130.02 km/h) |
| 80 mph (128.75 km/h) | 86.17 mph (138.68 km/h) |
| 85 mph (136.79 km/h) | 91.56 mph (147.35 km/h) |
| 90 mph (144.84 km/h) | 96.95 mph (156.02 km/h) |
| 95 mph (152.89 km/h) | 102.33 mph (164.69 km/h) |
| 100 mph (160.93 km/h) | 107.72 mph (173.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 2318 | 2497 | 2607 | 2726 | 2811 | 2904 | 3015 | 3168 | 3321 | 3490 | 3626 | 3873 | 4144 | 4357 | 4493 | 4569 | 4849 | 5240 | 6089 |
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