Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-21 | 265/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.72 (729.4) | 30.39 (771.9) | 1.67 (42.5) 5.8% |
| Width inches (mm) | 9.65 (245) | 10.43 (265) | 0.79 (20) 8.2% |
| Circum. inches (mm) | 90.22 (2291.48) | 95.47 (2425) | 5.26 (133.52) 5.8% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.69 (119.25) | 0.84 (21.25) 21.7% |
| Revolutions per mile (km) | 702.32 (436.4) | 663.65 (412.37) | -38.67 (-24.03) -5.5% |
265/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.17 mph (34.06 km/h) |
| 25 mph (40.23 km/h) | 26.46 mph (42.58 km/h) |
| 30 mph (48.28 km/h) | 31.75 mph (51.09 km/h) |
| 35 mph (56.33 km/h) | 37.04 mph (59.61 km/h) |
| 40 mph (64.37 km/h) | 42.33 mph (68.12 km/h) |
| 45 mph (72.42 km/h) | 47.62 mph (76.64 km/h) |
| 50 mph (80.47 km/h) | 52.91 mph (85.16 km/h) |
| 55 mph (88.51 km/h) | 58.2 mph (93.67 km/h) |
| 60 mph (96.56 km/h) | 63.5 mph (102.19 km/h) |
| 65 mph (104.61 km/h) | 68.79 mph (110.7 km/h) |
| 70 mph (112.65 km/h) | 74.08 mph (119.22 km/h) |
| 75 mph (120.7 km/h) | 79.37 mph (127.73 km/h) |
| 80 mph (128.75 km/h) | 84.66 mph (136.25 km/h) |
| 85 mph (136.79 km/h) | 89.95 mph (144.77 km/h) |
| 90 mph (144.84 km/h) | 95.24 mph (153.28 km/h) |
| 95 mph (152.89 km/h) | 100.54 mph (161.8 km/h) |
| 100 mph (160.93 km/h) | 105.83 mph (170.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1689 | 1962 | 2113 | 2206 | 2307 | 2379 | 2458 | 2551 | 2681 | 2810 | 2954 | 3069 | 3277 | 3507 | 3687 | 3802 | 3866 | 4104 | 4434 | 5153 |
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