Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/35-18 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.2 (614.7) | 25.4 (645.2) | 1.2 (30.5) 5% |
| Width inches (mm) | 8.86 (225) | 9.25 (235) | 0.39 (10) 4.4% |
| Circum. inches (mm) | 76.03 (1931.14) | 79.8 (2026.96) | 3.77 (95.82) 5% |
| Sidewall Height inches (mm) | 3.1 (78.75) | 3.7 (94) | 0.6 (15.25) 19.4% |
| Revolutions per mile (km) | 833.37 (517.83) | 793.97 (493.35) | -39.4 (-24.48) -4.7% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.99 mph (33.78 km/h) |
| 25 mph (40.23 km/h) | 26.24 mph (42.23 km/h) |
| 30 mph (48.28 km/h) | 31.49 mph (50.68 km/h) |
| 35 mph (56.33 km/h) | 36.74 mph (59.12 km/h) |
| 40 mph (64.37 km/h) | 41.98 mph (67.57 km/h) |
| 45 mph (72.42 km/h) | 47.23 mph (76.01 km/h) |
| 50 mph (80.47 km/h) | 52.48 mph (84.46 km/h) |
| 55 mph (88.51 km/h) | 57.73 mph (92.91 km/h) |
| 60 mph (96.56 km/h) | 62.98 mph (101.35 km/h) |
| 65 mph (104.61 km/h) | 68.23 mph (109.8 km/h) |
| 70 mph (112.65 km/h) | 73.47 mph (118.24 km/h) |
| 75 mph (120.7 km/h) | 78.72 mph (126.69 km/h) |
| 80 mph (128.75 km/h) | 83.97 mph (135.14 km/h) |
| 85 mph (136.79 km/h) | 89.22 mph (143.58 km/h) |
| 90 mph (144.84 km/h) | 94.47 mph (152.03 km/h) |
| 95 mph (152.89 km/h) | 99.71 mph (160.47 km/h) |
| 100 mph (160.93 km/h) | 104.96 mph (168.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2021 | 2347 | 2528 | 2640 | 2760 | 2846 | 2940 | 3052 | 3207 | 3362 | 3534 | 3671 | 3921 | 4196 | 4411 | 4548 | 4626 | 4909 | 5305 | 6165 |
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