Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 265/30-21 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.26 (692.4) | 26.68 (677.7) | -0.58 (-14.7) -2.1% |
| Width inches (mm) | 10.43 (265) | 9.65 (245) | -0.79 (-20) -7.5% |
| Circum. inches (mm) | 85.64 (2175.24) | 83.82 (2129.06) | -1.82 (-46.18) -2.1% |
| Sidewall Height inches (mm) | 3.13 (79.5) | 4.34 (110.25) | 1.21 (30.75) 38.7% |
| Revolutions per mile (km) | 739.85 (459.72) | 755.9 (469.69) | 16.05 (9.97) 2.2% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.5 km/h) |
| 25 mph (40.23 km/h) | 24.47 mph (39.38 km/h) |
| 30 mph (48.28 km/h) | 29.36 mph (47.26 km/h) |
| 35 mph (56.33 km/h) | 34.26 mph (55.13 km/h) |
| 40 mph (64.37 km/h) | 39.15 mph (63.01 km/h) |
| 45 mph (72.42 km/h) | 44.04 mph (70.88 km/h) |
| 50 mph (80.47 km/h) | 48.94 mph (78.76 km/h) |
| 55 mph (88.51 km/h) | 53.83 mph (86.63 km/h) |
| 60 mph (96.56 km/h) | 58.73 mph (94.51 km/h) |
| 65 mph (104.61 km/h) | 63.62 mph (102.39 km/h) |
| 70 mph (112.65 km/h) | 68.51 mph (110.26 km/h) |
| 75 mph (120.7 km/h) | 73.41 mph (118.14 km/h) |
| 80 mph (128.75 km/h) | 78.3 mph (126.01 km/h) |
| 85 mph (136.79 km/h) | 83.2 mph (133.89 km/h) |
| 90 mph (144.84 km/h) | 88.09 mph (141.77 km/h) |
| 95 mph (152.89 km/h) | 92.98 mph (149.64 km/h) |
| 100 mph (160.93 km/h) | 97.88 mph (157.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1924 | 2235 | 2407 | 2513 | 2628 | 2709 | 2799 | 2906 | 3053 | 3201 | 3364 | 3495 | 3733 | 3995 | 4199 | 4330 | 4404 | 4674 | 5050 | 5869 |
Better Fuel Economy Factory Ratios Increased Power
