BCD GUIDE
| USAMade BCD Guide | |||||||
| Measurement Between | Bolt Circle | ||||||
| # of Bolt | Adjacent Holes | Diameter | |||||
| Holes | (Millimeter) | (Inches) | ( BCD ) | ||||
| 4 | 45.3 | 1.78 | 64 mm | ||||
| 4 | 66.5 | 2.62 | 94 mm | ||||
| 4 | 73.6 | 2.90 | 104 mm | ||||
| 5 | 34.3 | 1.35 | 58 mm | ||||
| 5 | 43.5 | 1.71 | 74 mm | ||||
| 5 | 64.7 | 2.55 | 110 mm | ||||
| 5 | 76.4 | 3.01 | 130 mm | ||||
| NOTE: This applies ONLY when the bolt holes are evenly spaced around the circle. | |||||||
| The newer 4-Bolt Shimano cranks have non-uniform spacing. Select our Shimano style chainrings. | |||||||