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How to measure Bolt Circle Diameter (BCD). Bolt Circle Diameter or BCD is the diameter of the circle that goes through the center of all of the bolts on your chainring. On bicycle chainring this dimension is usually measured in millimeters.
(on prescription): Seen on a prescription, q.d. (or qd) means one a day (from the Latin quaque die). The abbreviation is sometimes written without a period in capital letters as QD. However it is written, it is one of a number of hallowed abbreviations of Latin terms that have been traditionally used in prescriptions to specify the frequency with which medicines should be taken. Other examples include: 1  b.i.d. (bid or BID) is twice a day; b.i.d.. stands for bis in die (which means, in Latin, twice a day).  t.i.d. (or tid or TID) is three times a day ; t.i.d. stands for ter in die (in Latin, 3 times a day).