Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 33/12.5-18 | 305/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 33.02 (838.8) | 33.61 (853.7) | 0.59 (14.9) 1.8% |
| Width inches (mm) | 12.52 (318) | 12.01 (305) | -0.51 (-13) -4.1% |
| Circum. inches (mm) | 103.75 (2635.17) | 105.59 (2681.98) | 1.84 (46.81) 1.8% |
| Sidewall Height inches (mm) | 7.51 (190.8) | 7.81 (198.25) | 0.29 (7.45) 3.9% |
| Revolutions per mile (km) | 610.72 (379.48) | 600.06 (372.86) | -10.66 (-6.62) -1.7% |
305/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.36 mph (32.76 km/h) |
| 25 mph (40.23 km/h) | 25.44 mph (40.95 km/h) |
| 30 mph (48.28 km/h) | 30.53 mph (49.14 km/h) |
| 35 mph (56.33 km/h) | 35.62 mph (57.33 km/h) |
| 40 mph (64.37 km/h) | 40.71 mph (65.52 km/h) |
| 45 mph (72.42 km/h) | 45.8 mph (73.71 km/h) |
| 50 mph (80.47 km/h) | 50.89 mph (81.9 km/h) |
| 55 mph (88.51 km/h) | 55.98 mph (90.09 km/h) |
| 60 mph (96.56 km/h) | 61.07 mph (98.28 km/h) |
| 65 mph (104.61 km/h) | 66.15 mph (106.47 km/h) |
| 70 mph (112.65 km/h) | 71.24 mph (114.66 km/h) |
| 75 mph (120.7 km/h) | 76.33 mph (122.85 km/h) |
| 80 mph (128.75 km/h) | 81.42 mph (131.03 km/h) |
| 85 mph (136.79 km/h) | 86.51 mph (139.22 km/h) |
| 90 mph (144.84 km/h) | 91.6 mph (147.41 km/h) |
| 95 mph (152.89 km/h) | 96.69 mph (155.6 km/h) |
| 100 mph (160.93 km/h) | 101.78 mph (163.79 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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