Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/40-18 | 305/35-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.98 (685.2) | 26.41 (670.7) | -0.57 (-14.5) -2.1% |
| Width inches (mm) | 11.22 (285) | 12.01 (305) | 0.79 (20) 7% |
| Circum. inches (mm) | 84.75 (2152.62) | 82.96 (2107.07) | -1.79 (-45.55) -2.1% |
| Sidewall Height inches (mm) | 4.49 (114) | 4.2 (106.75) | -0.29 (-7.25) -6.4% |
| Revolutions per mile (km) | 747.62 (464.55) | 763.78 (474.59) | 16.16 (10.04) 2.2% |
305/35-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.51 km/h) |
| 25 mph (40.23 km/h) | 24.47 mph (39.38 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.26 km/h) |
| 35 mph (56.33 km/h) | 34.26 mph (55.14 km/h) |
| 40 mph (64.37 km/h) | 39.15 mph (63.01 km/h) |
| 45 mph (72.42 km/h) | 44.05 mph (70.89 km/h) |
| 50 mph (80.47 km/h) | 48.94 mph (78.76 km/h) |
| 55 mph (88.51 km/h) | 53.84 mph (86.64 km/h) |
| 60 mph (96.56 km/h) | 58.73 mph (94.52 km/h) |
| 65 mph (104.61 km/h) | 63.62 mph (102.39 km/h) |
| 70 mph (112.65 km/h) | 68.52 mph (110.27 km/h) |
| 75 mph (120.7 km/h) | 73.41 mph (118.15 km/h) |
| 80 mph (128.75 km/h) | 78.31 mph (126.02 km/h) |
| 85 mph (136.79 km/h) | 83.2 mph (133.9 km/h) |
| 90 mph (144.84 km/h) | 88.1 mph (141.78 km/h) |
| 95 mph (152.89 km/h) | 92.99 mph (149.65 km/h) |
| 100 mph (160.93 km/h) | 97.88 mph (157.53 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1944 | 2258 | 2432 | 2539 | 2655 | 2738 | 2829 | 2936 | 3085 | 3234 | 3399 | 3532 | 3772 | 4036 | 4243 | 4375 | 4450 | 4723 | 5103 | 5930 |
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