Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/70-18 | 305/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 34.81 (884.2) | 33.61 (853.7) | -1.2 (-30.5) -3.4% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 109.36 (2777.8) | 105.59 (2681.98) | -3.77 (-95.82) -3.4% |
| Sidewall Height inches (mm) | 8.41 (213.5) | 7.81 (198.25) | -0.6 (-15.25) -7.1% |
| Revolutions per mile (km) | 579.36 (360) | 600.06 (372.86) | 20.7 (12.86) 3.6% |
305/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.31 mph (31.08 km/h) |
| 25 mph (40.23 km/h) | 24.14 mph (38.85 km/h) |
| 30 mph (48.28 km/h) | 28.97 mph (46.62 km/h) |
| 35 mph (56.33 km/h) | 33.79 mph (54.38 km/h) |
| 40 mph (64.37 km/h) | 38.62 mph (62.15 km/h) |
| 45 mph (72.42 km/h) | 43.45 mph (69.92 km/h) |
| 50 mph (80.47 km/h) | 48.28 mph (77.69 km/h) |
| 55 mph (88.51 km/h) | 53.1 mph (85.46 km/h) |
| 60 mph (96.56 km/h) | 57.93 mph (93.23 km/h) |
| 65 mph (104.61 km/h) | 62.76 mph (101 km/h) |
| 70 mph (112.65 km/h) | 67.59 mph (108.77 km/h) |
| 75 mph (120.7 km/h) | 72.41 mph (116.54 km/h) |
| 80 mph (128.75 km/h) | 77.24 mph (124.31 km/h) |
| 85 mph (136.79 km/h) | 82.07 mph (132.08 km/h) |
| 90 mph (144.84 km/h) | 86.9 mph (139.85 km/h) |
| 95 mph (152.89 km/h) | 91.72 mph (147.61 km/h) |
| 100 mph (160.93 km/h) | 96.55 mph (155.38 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1527 | 1774 | 1910 | 1995 | 2086 | 2151 | 2222 | 2307 | 2424 | 2541 | 2671 | 2775 | 2963 | 3171 | 3333 | 3437 | 3496 | 3710 | 4009 | 4659 |
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