Where do you find the BCD on a chainring?
Sometimes it is stamped or engraved on the back side of the chainring. If it is not labeled on your chainring you will need to measure it. On a chainring with 4 bolts the BCD is the distance between two bolts across from each other.
What does the BCD stand for in bolts?
BCD is an acronym for Bolt Circle Diameter. It’s the measurement (diameter) of an imaginary circle passing through the centers of all the bolts in a round pattern – like chainring bolts that hold the rings to the crank.
What kind of gold does vanrycke jewelry have?
VANRYCKE JEWELS ARE MADE OF 18K GOLD AND DIAMONDS. THEY MUST BE TREATED WITH THE UTMOST CARE. SOME PRECAUTIONS WILL ENABLE YOU TO KEEP IT IN GOOD CONDITION: – AVOID SHOCKS AS MUCH AS POSSIBLE TO LIMIT SCRATCHES AND SNAGS ON THE STONES WHEN YOU WEAR YOUR VANRYCKE JEWEL.
What’s the size of a chainring on a triple crank?
On triple cranks, and on most mountain 2×10 (and 2×11) set-ups, there are 2 Bolt Circle Diameters — one for the large ring (or rings), and one for the small chainring. In this case, they are usually designated as something like 104/64 BCD. That means 104 mm bolt circle diameter for the larger ring, and a 64 mm diameter for the smaller ring.
How to identify the bolt pattern on a chainring?
Our PDF templates linked from this page — example at right — cover BCDs for all chainrings in commercial production, old and new, of which we know. You identify the bolt pattern simply by laying a chainring down on a template printout and rotating the chainring until the bolt holes align.
How many bolt holes are in a bicycle chainring?
Most bicycle chainrings have between three and six bolt holes to attach them to the crank, spaced around a bolt circle. The tables at the bottom of this page give bolt-circle diameters for major brands. Aftermarket and less prominent brands tend to use the same bolt-circle patterns as the major brands.