Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/30-21 | 245/35-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.02 (686.4) | 26.75 (679.5) | -0.27 (-6.9) -1% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 84.9 (2156.39) | 84.04 (2134.71) | -0.85 (-21.68) -1% |
| Sidewall Height inches (mm) | 3.01 (76.5) | 3.38 (85.75) | 0.36 (9.25) 12.1% |
| Revolutions per mile (km) | 746.31 (463.74) | 753.89 (468.45) | 7.58 (4.71) 1% |
245/35-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.8 mph (31.86 km/h) |
| 25 mph (40.23 km/h) | 24.75 mph (39.83 km/h) |
| 30 mph (48.28 km/h) | 29.7 mph (47.8 km/h) |
| 35 mph (56.33 km/h) | 34.65 mph (55.76 km/h) |
| 40 mph (64.37 km/h) | 39.6 mph (63.73 km/h) |
| 45 mph (72.42 km/h) | 44.55 mph (71.69 km/h) |
| 50 mph (80.47 km/h) | 49.5 mph (79.66 km/h) |
| 55 mph (88.51 km/h) | 54.45 mph (87.62 km/h) |
| 60 mph (96.56 km/h) | 59.4 mph (95.59 km/h) |
| 65 mph (104.61 km/h) | 64.35 mph (103.56 km/h) |
| 70 mph (112.65 km/h) | 69.3 mph (111.52 km/h) |
| 75 mph (120.7 km/h) | 74.25 mph (119.49 km/h) |
| 80 mph (128.75 km/h) | 79.2 mph (127.45 km/h) |
| 85 mph (136.79 km/h) | 84.15 mph (135.42 km/h) |
| 90 mph (144.84 km/h) | 89.1 mph (143.39 km/h) |
| 95 mph (152.89 km/h) | 94.05 mph (151.35 km/h) |
| 100 mph (160.93 km/h) | 98.99 mph (159.32 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1919 | 2229 | 2400 | 2506 | 2621 | 2702 | 2792 | 2898 | 3045 | 3192 | 3355 | 3486 | 3723 | 3984 | 4188 | 4319 | 4392 | 4662 | 5037 | 5854 |
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