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@ObiWomKenobi
4 bolt chainrings would be 104bcd
106bcd are 3 bolt afaik
unless you mean really micro, i.e mtb inner ring, which is 64 bcd like this: http://www.ebay.co.uk/itm/gobike88-Driveline-black-chainring-chainring-26T-BCD-64mm-27g-MTB-CHAINRING-207-/160815885116?pt=Cycling_Parts_Accessories&hash=item25715fab3c