Chain Rings

Looks like the 94BCD crank is going to be a bit of a handicap in replacement ring availability. Appears 4 arm 94BCD is not exactly common. (thats 66mm hole to hole) Only FSA themselves or Control Tech have them available.

Bolt circle diameters in hole to hole distancesWhen buying chainrings you need to know the BCD aka  Bolt Circle Diameter. This is the measurement of an imaginary circle on the chainring hitting all the bolt holes. The best way to calculate this is by measuring the exact distance (center to center) between 2 neighbouring bolt holes. Then find that number on the correct chart below to determine the BCD for your chainring and cranks…


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