Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-21 | 235/55-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.97 (735.9) | 30.18 (766.5) | 1.2 (30.6) 4.2% |
| Width inches (mm) | 8.86 (225) | 9.25 (235) | 0.39 (10) 4.4% |
| Circum. inches (mm) | 91.02 (2311.9) | 94.8 (2408.03) | 3.78 (96.13) 4.2% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 5.09 (129.25) | 1.1 (28) 27.7% |
| Revolutions per mile (km) | 696.11 (432.54) | 668.32 (415.28) | -27.79 (-17.27) -4% |
235/55-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.83 mph (33.53 km/h) |
| 25 mph (40.23 km/h) | 26.04 mph (41.91 km/h) |
| 30 mph (48.28 km/h) | 31.25 mph (50.29 km/h) |
| 35 mph (56.33 km/h) | 36.46 mph (58.67 km/h) |
| 40 mph (64.37 km/h) | 41.66 mph (67.05 km/h) |
| 45 mph (72.42 km/h) | 46.87 mph (75.43 km/h) |
| 50 mph (80.47 km/h) | 52.08 mph (83.81 km/h) |
| 55 mph (88.51 km/h) | 57.29 mph (92.19 km/h) |
| 60 mph (96.56 km/h) | 62.49 mph (100.58 km/h) |
| 65 mph (104.61 km/h) | 67.7 mph (108.96 km/h) |
| 70 mph (112.65 km/h) | 72.91 mph (117.34 km/h) |
| 75 mph (120.7 km/h) | 78.12 mph (125.72 km/h) |
| 80 mph (128.75 km/h) | 83.33 mph (134.1 km/h) |
| 85 mph (136.79 km/h) | 88.53 mph (142.48 km/h) |
| 90 mph (144.84 km/h) | 93.74 mph (150.86 km/h) |
| 95 mph (152.89 km/h) | 98.95 mph (159.25 km/h) |
| 100 mph (160.93 km/h) | 104.16 mph (167.63 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1701 | 1976 | 2128 | 2222 | 2323 | 2396 | 2475 | 2569 | 2699 | 2830 | 2975 | 3090 | 3300 | 3532 | 3713 | 3829 | 3894 | 4132 | 4465 | 5189 |
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