Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 305/35-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 26.41 (670.7) | -1.83 (-46.5) -6.5% |
| Width inches (mm) | 12.8 (325) | 12.01 (305) | -0.79 (-20) -6.2% |
| Circum. inches (mm) | 88.71 (2253.15) | 82.96 (2107.07) | -5.75 (-146.08) -6.5% |
| Sidewall Height inches (mm) | 5.12 (130) | 4.2 (106.75) | -0.92 (-23.25) -17.9% |
| Revolutions per mile (km) | 714.26 (443.82) | 763.78 (474.59) | 49.52 (30.77) 6.9% |
305/35-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.7 mph (30.1 km/h) |
| 25 mph (40.23 km/h) | 23.38 mph (37.63 km/h) |
| 30 mph (48.28 km/h) | 28.05 mph (45.15 km/h) |
| 35 mph (56.33 km/h) | 32.73 mph (52.68 km/h) |
| 40 mph (64.37 km/h) | 37.41 mph (60.2 km/h) |
| 45 mph (72.42 km/h) | 42.08 mph (67.73 km/h) |
| 50 mph (80.47 km/h) | 46.76 mph (75.25 km/h) |
| 55 mph (88.51 km/h) | 51.43 mph (82.78 km/h) |
| 60 mph (96.56 km/h) | 56.11 mph (90.3 km/h) |
| 65 mph (104.61 km/h) | 60.79 mph (97.83 km/h) |
| 70 mph (112.65 km/h) | 65.46 mph (105.35 km/h) |
| 75 mph (120.7 km/h) | 70.14 mph (112.88 km/h) |
| 80 mph (128.75 km/h) | 74.81 mph (120.4 km/h) |
| 85 mph (136.79 km/h) | 79.49 mph (127.93 km/h) |
| 90 mph (144.84 km/h) | 84.16 mph (135.45 km/h) |
| 95 mph (152.89 km/h) | 88.84 mph (142.98 km/h) |
| 100 mph (160.93 km/h) | 93.52 mph (150.5 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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