Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-16 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.25 (641.4) | 25.4 (645.2) | 0.15 (3.8) 0.6% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 79.33 (2015.02) | 79.8 (2026.96) | 0.47 (11.94) 0.6% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 3.7 (94) | -0.93 (-23.5) -20% |
| Revolutions per mile (km) | 798.67 (496.27) | 793.97 (493.35) | -4.7 (-2.92) -0.6% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.12 mph (32.38 km/h) |
| 25 mph (40.23 km/h) | 25.15 mph (40.47 km/h) |
| 30 mph (48.28 km/h) | 30.18 mph (48.57 km/h) |
| 35 mph (56.33 km/h) | 35.21 mph (56.66 km/h) |
| 40 mph (64.37 km/h) | 40.24 mph (64.76 km/h) |
| 45 mph (72.42 km/h) | 45.27 mph (72.85 km/h) |
| 50 mph (80.47 km/h) | 50.3 mph (80.94 km/h) |
| 55 mph (88.51 km/h) | 55.33 mph (89.04 km/h) |
| 60 mph (96.56 km/h) | 60.36 mph (97.13 km/h) |
| 65 mph (104.61 km/h) | 65.39 mph (105.23 km/h) |
| 70 mph (112.65 km/h) | 70.41 mph (113.32 km/h) |
| 75 mph (120.7 km/h) | 75.44 mph (121.42 km/h) |
| 80 mph (128.75 km/h) | 80.47 mph (129.51 km/h) |
| 85 mph (136.79 km/h) | 85.5 mph (137.6 km/h) |
| 90 mph (144.84 km/h) | 90.53 mph (145.7 km/h) |
| 95 mph (152.89 km/h) | 95.56 mph (153.79 km/h) |
| 100 mph (160.93 km/h) | 100.59 mph (161.89 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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