Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 235/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 30.03 (762.7) | 1.65 (42) 5.8% |
| Width inches (mm) | 6.1 (155) | 9.25 (235) | 3.15 (80) 51.6% |
| Circum. inches (mm) | 89.14 (2264.15) | 94.33 (2396.09) | 5.19 (131.95) 5.8% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 6.01 (152.75) | 0.83 (21) 15.9% |
| Revolutions per mile (km) | 710.8 (441.67) | 671.65 (417.35) | -39.14 (-24.32) -5.5% |
235/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.17 mph (34.06 km/h) |
| 25 mph (40.23 km/h) | 26.46 mph (42.58 km/h) |
| 30 mph (48.28 km/h) | 31.75 mph (51.09 km/h) |
| 35 mph (56.33 km/h) | 37.04 mph (59.61 km/h) |
| 40 mph (64.37 km/h) | 42.33 mph (68.13 km/h) |
| 45 mph (72.42 km/h) | 47.62 mph (76.64 km/h) |
| 50 mph (80.47 km/h) | 52.91 mph (85.16 km/h) |
| 55 mph (88.51 km/h) | 58.21 mph (93.67 km/h) |
| 60 mph (96.56 km/h) | 63.5 mph (102.19 km/h) |
| 65 mph (104.61 km/h) | 68.79 mph (110.7 km/h) |
| 70 mph (112.65 km/h) | 74.08 mph (119.22 km/h) |
| 75 mph (120.7 km/h) | 79.37 mph (127.74 km/h) |
| 80 mph (128.75 km/h) | 84.66 mph (136.25 km/h) |
| 85 mph (136.79 km/h) | 89.95 mph (144.77 km/h) |
| 90 mph (144.84 km/h) | 95.24 mph (153.28 km/h) |
| 95 mph (152.89 km/h) | 100.54 mph (161.8 km/h) |
| 100 mph (160.93 km/h) | 105.83 mph (170.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1709 | 1986 | 2138 | 2233 | 2335 | 2407 | 2487 | 2582 | 2713 | 2844 | 2989 | 3106 | 3317 | 3549 | 3731 | 3848 | 3913 | 4153 | 4488 | 5215 |
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