Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/30-20 | 285/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.2 (691) | 26.73 (679) | -0.47 (-12) -1.7% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 85.47 (2170.84) | 83.98 (2133.14) | -1.48 (-37.7) -1.7% |
| Sidewall Height inches (mm) | 3.6 (91.5) | 3.37 (85.5) | -0.24 (-6) -6.6% |
| Revolutions per mile (km) | 741.35 (460.65) | 754.45 (468.79) | 13.1 (8.14) 1.8% |
285/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.65 mph (31.63 km/h) |
| 25 mph (40.23 km/h) | 24.57 mph (39.53 km/h) |
| 30 mph (48.28 km/h) | 29.48 mph (47.44 km/h) |
| 35 mph (56.33 km/h) | 34.39 mph (55.35 km/h) |
| 40 mph (64.37 km/h) | 39.31 mph (63.26 km/h) |
| 45 mph (72.42 km/h) | 44.22 mph (71.16 km/h) |
| 50 mph (80.47 km/h) | 49.13 mph (79.07 km/h) |
| 55 mph (88.51 km/h) | 54.04 mph (86.98 km/h) |
| 60 mph (96.56 km/h) | 58.96 mph (94.88 km/h) |
| 65 mph (104.61 km/h) | 63.87 mph (102.79 km/h) |
| 70 mph (112.65 km/h) | 68.78 mph (110.7 km/h) |
| 75 mph (120.7 km/h) | 73.7 mph (118.6 km/h) |
| 80 mph (128.75 km/h) | 78.61 mph (126.51 km/h) |
| 85 mph (136.79 km/h) | 83.52 mph (134.42 km/h) |
| 90 mph (144.84 km/h) | 88.44 mph (142.33 km/h) |
| 95 mph (152.89 km/h) | 93.35 mph (150.23 km/h) |
| 100 mph (160.93 km/h) | 98.26 mph (158.14 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1920 | 2230 | 2402 | 2508 | 2623 | 2704 | 2794 | 2900 | 3047 | 3194 | 3358 | 3489 | 3725 | 3987 | 4191 | 4322 | 4395 | 4665 | 5041 | 5858 |
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