Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-20 | 235/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.25 (743) | 27.25 (692.2) | -2 (-50.8) -6.8% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 91.9 (2334.2) | 85.61 (2174.61) | -6.28 (-159.59) -6.8% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 4.63 (117.5) | 0 (0) 0% |
| Revolutions per mile (km) | 689.46 (428.41) | 740.06 (459.85) | 50.6 (31.44) 7.3% |
235/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.63 mph (29.99 km/h) |
| 25 mph (40.23 km/h) | 23.29 mph (37.48 km/h) |
| 30 mph (48.28 km/h) | 27.95 mph (44.98 km/h) |
| 35 mph (56.33 km/h) | 32.61 mph (52.48 km/h) |
| 40 mph (64.37 km/h) | 37.27 mph (59.97 km/h) |
| 45 mph (72.42 km/h) | 41.92 mph (67.47 km/h) |
| 50 mph (80.47 km/h) | 46.58 mph (74.97 km/h) |
| 55 mph (88.51 km/h) | 51.24 mph (82.46 km/h) |
| 60 mph (96.56 km/h) | 55.9 mph (89.96 km/h) |
| 65 mph (104.61 km/h) | 60.56 mph (97.46 km/h) |
| 70 mph (112.65 km/h) | 65.21 mph (104.95 km/h) |
| 75 mph (120.7 km/h) | 69.87 mph (112.45 km/h) |
| 80 mph (128.75 km/h) | 74.53 mph (119.95 km/h) |
| 85 mph (136.79 km/h) | 79.19 mph (127.44 km/h) |
| 90 mph (144.84 km/h) | 83.85 mph (134.94 km/h) |
| 95 mph (152.89 km/h) | 88.5 mph (142.43 km/h) |
| 100 mph (160.93 km/h) | 93.16 mph (149.93 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1883 | 2188 | 2356 | 2460 | 2573 | 2653 | 2741 | 2845 | 2989 | 3134 | 3294 | 3422 | 3654 | 3911 | 4111 | 4239 | 4312 | 4576 | 4945 | 5746 |
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