Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/50-21 | 265/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.83 (808.4) | 31.56 (801.7) | -0.26 (-6.7) -0.8% |
| Width inches (mm) | 10.83 (275) | 10.43 (265) | -0.39 (-10) -3.6% |
| Circum. inches (mm) | 99.99 (2539.66) | 99.16 (2518.61) | -0.83 (-21.05) -0.8% |
| Sidewall Height inches (mm) | 5.41 (137.5) | 6.78 (172.25) | 1.37 (34.75) 25.3% |
| Revolutions per mile (km) | 633.68 (393.75) | 638.98 (397.04) | 5.3 (3.29) 0.8% |
265/65-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.83 mph (31.92 km/h) |
| 25 mph (40.23 km/h) | 24.79 mph (39.9 km/h) |
| 30 mph (48.28 km/h) | 29.75 mph (47.88 km/h) |
| 35 mph (56.33 km/h) | 34.71 mph (55.86 km/h) |
| 40 mph (64.37 km/h) | 39.67 mph (63.84 km/h) |
| 45 mph (72.42 km/h) | 44.63 mph (71.82 km/h) |
| 50 mph (80.47 km/h) | 49.59 mph (79.8 km/h) |
| 55 mph (88.51 km/h) | 54.54 mph (87.78 km/h) |
| 60 mph (96.56 km/h) | 59.5 mph (95.76 km/h) |
| 65 mph (104.61 km/h) | 64.46 mph (103.74 km/h) |
| 70 mph (112.65 km/h) | 69.42 mph (111.72 km/h) |
| 75 mph (120.7 km/h) | 74.38 mph (119.7 km/h) |
| 80 mph (128.75 km/h) | 79.34 mph (127.68 km/h) |
| 85 mph (136.79 km/h) | 84.3 mph (135.66 km/h) |
| 90 mph (144.84 km/h) | 89.25 mph (143.64 km/h) |
| 95 mph (152.89 km/h) | 94.21 mph (151.62 km/h) |
| 100 mph (160.93 km/h) | 99.17 mph (159.6 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1626 | 1889 | 2034 | 2124 | 2221 | 2290 | 2366 | 2456 | 2581 | 2706 | 2844 | 2955 | 3155 | 3377 | 3550 | 3660 | 3723 | 3951 | 4269 | 4961 |
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