Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/85-18 | 235/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.7 (703.7) | 29.1 (739.2) | 1.4 (35.5) 5% |
| Width inches (mm) | 5.71 (145) | 9.25 (235) | 3.54 (90) 62.1% |
| Circum. inches (mm) | 87.04 (2210.74) | 91.43 (2322.27) | 4.39 (111.53) 5% |
| Sidewall Height inches (mm) | 4.85 (123.25) | 5.55 (141) | 0.7 (17.75) 14.4% |
| Revolutions per mile (km) | 727.97 (452.34) | 693.01 (430.61) | -34.96 (-21.72) -4.8% |
235/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.01 mph (33.81 km/h) |
| 25 mph (40.23 km/h) | 26.26 mph (42.26 km/h) |
| 30 mph (48.28 km/h) | 31.51 mph (50.72 km/h) |
| 35 mph (56.33 km/h) | 36.77 mph (59.17 km/h) |
| 40 mph (64.37 km/h) | 42.02 mph (67.62 km/h) |
| 45 mph (72.42 km/h) | 47.27 mph (76.07 km/h) |
| 50 mph (80.47 km/h) | 52.52 mph (84.53 km/h) |
| 55 mph (88.51 km/h) | 57.77 mph (92.98 km/h) |
| 60 mph (96.56 km/h) | 63.03 mph (101.43 km/h) |
| 65 mph (104.61 km/h) | 68.28 mph (109.88 km/h) |
| 70 mph (112.65 km/h) | 73.53 mph (118.34 km/h) |
| 75 mph (120.7 km/h) | 78.78 mph (126.79 km/h) |
| 80 mph (128.75 km/h) | 84.04 mph (135.24 km/h) |
| 85 mph (136.79 km/h) | 89.29 mph (143.7 km/h) |
| 90 mph (144.84 km/h) | 94.54 mph (152.15 km/h) |
| 95 mph (152.89 km/h) | 99.79 mph (160.6 km/h) |
| 100 mph (160.93 km/h) | 105.04 mph (169.05 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1764 | 2049 | 2206 | 2304 | 2409 | 2484 | 2567 | 2664 | 2799 | 2934 | 3084 | 3204 | 3422 | 3662 | 3850 | 3970 | 4037 | 4285 | 4630 | 5381 |
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