Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/60-18 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.1 (739.2) | 25.4 (645.2) | -3.7 (-94) -12.7% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 91.43 (2322.27) | 79.8 (2026.96) | -11.63 (-295.31) -12.7% |
| Sidewall Height inches (mm) | 5.55 (141) | 3.7 (94) | -1.85 (-47) -33.3% |
| Revolutions per mile (km) | 693.01 (430.61) | 793.97 (493.35) | 100.96 (62.74) 14.6% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.46 mph (28.09 km/h) |
| 25 mph (40.23 km/h) | 21.82 mph (35.12 km/h) |
| 30 mph (48.28 km/h) | 26.19 mph (42.14 km/h) |
| 35 mph (56.33 km/h) | 30.55 mph (49.16 km/h) |
| 40 mph (64.37 km/h) | 34.91 mph (56.19 km/h) |
| 45 mph (72.42 km/h) | 39.28 mph (63.21 km/h) |
| 50 mph (80.47 km/h) | 43.64 mph (70.23 km/h) |
| 55 mph (88.51 km/h) | 48.01 mph (77.26 km/h) |
| 60 mph (96.56 km/h) | 52.37 mph (84.28 km/h) |
| 65 mph (104.61 km/h) | 56.73 mph (91.31 km/h) |
| 70 mph (112.65 km/h) | 61.1 mph (98.33 km/h) |
| 75 mph (120.7 km/h) | 65.46 mph (105.35 km/h) |
| 80 mph (128.75 km/h) | 69.83 mph (112.38 km/h) |
| 85 mph (136.79 km/h) | 74.19 mph (119.4 km/h) |
| 90 mph (144.84 km/h) | 78.56 mph (126.42 km/h) |
| 95 mph (152.89 km/h) | 82.92 mph (133.45 km/h) |
| 100 mph (160.93 km/h) | 87.28 mph (140.47 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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