Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/50-18 | 235/40-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.65 (702.2) | 25.4 (645.2) | -2.24 (-57) -8.1% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 86.85 (2206.03) | 79.8 (2026.96) | -7.05 (-179.07) -8.1% |
| Sidewall Height inches (mm) | 4.82 (122.5) | 3.7 (94) | -1.12 (-28.5) -23.3% |
| Revolutions per mile (km) | 729.52 (453.3) | 793.97 (493.35) | 64.45 (40.05) 8.8% |
235/40-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.38 mph (29.57 km/h) |
| 25 mph (40.23 km/h) | 22.97 mph (36.97 km/h) |
| 30 mph (48.28 km/h) | 27.56 mph (44.36 km/h) |
| 35 mph (56.33 km/h) | 32.16 mph (51.75 km/h) |
| 40 mph (64.37 km/h) | 36.75 mph (59.15 km/h) |
| 45 mph (72.42 km/h) | 41.35 mph (66.54 km/h) |
| 50 mph (80.47 km/h) | 45.94 mph (73.94 km/h) |
| 55 mph (88.51 km/h) | 50.54 mph (81.33 km/h) |
| 60 mph (96.56 km/h) | 55.13 mph (88.72 km/h) |
| 65 mph (104.61 km/h) | 59.72 mph (96.12 km/h) |
| 70 mph (112.65 km/h) | 64.32 mph (103.51 km/h) |
| 75 mph (120.7 km/h) | 68.91 mph (110.9 km/h) |
| 80 mph (128.75 km/h) | 73.51 mph (118.3 km/h) |
| 85 mph (136.79 km/h) | 78.1 mph (125.69 km/h) |
| 90 mph (144.84 km/h) | 82.69 mph (133.08 km/h) |
| 95 mph (152.89 km/h) | 87.29 mph (140.48 km/h) |
| 100 mph (160.93 km/h) | 91.88 mph (147.87 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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