Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/35-18 | 255/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.48 (621.7) | 26.03 (661.2) | 1.56 (39.5) 6.4% |
| Width inches (mm) | 9.25 (235) | 10.04 (255) | 0.79 (20) 8.5% |
| Circum. inches (mm) | 76.89 (1953.13) | 81.78 (2077.22) | 4.89 (124.09) 6.4% |
| Sidewall Height inches (mm) | 3.24 (82.25) | 4.02 (102) | 0.78 (19.75) 24% |
| Revolutions per mile (km) | 823.98 (512) | 774.76 (481.41) | -49.22 (-30.59) -6% |
255/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.27 mph (34.23 km/h) |
| 25 mph (40.23 km/h) | 26.59 mph (42.79 km/h) |
| 30 mph (48.28 km/h) | 31.91 mph (51.35 km/h) |
| 35 mph (56.33 km/h) | 37.22 mph (59.91 km/h) |
| 40 mph (64.37 km/h) | 42.54 mph (68.46 km/h) |
| 45 mph (72.42 km/h) | 47.86 mph (77.02 km/h) |
| 50 mph (80.47 km/h) | 53.18 mph (85.58 km/h) |
| 55 mph (88.51 km/h) | 58.49 mph (94.14 km/h) |
| 60 mph (96.56 km/h) | 63.81 mph (102.7 km/h) |
| 65 mph (104.61 km/h) | 69.13 mph (111.25 km/h) |
| 70 mph (112.65 km/h) | 74.45 mph (119.81 km/h) |
| 75 mph (120.7 km/h) | 79.77 mph (128.37 km/h) |
| 80 mph (128.75 km/h) | 85.08 mph (136.93 km/h) |
| 85 mph (136.79 km/h) | 90.4 mph (145.49 km/h) |
| 90 mph (144.84 km/h) | 95.72 mph (154.04 km/h) |
| 95 mph (152.89 km/h) | 101.04 mph (162.6 km/h) |
| 100 mph (160.93 km/h) | 106.35 mph (171.16 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1972 | 2290 | 2467 | 2576 | 2693 | 2777 | 2869 | 2978 | 3129 | 3280 | 3448 | 3582 | 3826 | 4094 | 4304 | 4438 | 4514 | 4791 | 5177 | 6016 |
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