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  1. #1
    iab is offline
    Senior Member iab's Avatar
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    Jun 2006
    NW Burbs, Chicago
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    Smallest chainring for 157mm BCD?

    I have a 3-arm crank (101mm BCD I believe). It has 2 steel chainrings that are riveted together and these chainrings are the common setup. Simplex made an adaptor so you can screw together 2, 6-hole patterned chainrings for "custom" setups (see picture below). This adapter is for a 157mm BCD chainring. I have seen 46 teeth chainrings that will fit on this but is there anything smaller? I've seen smaller TA 6-hole rings but I just found out they are a 152mm BCD.

  2. #2
    feros ferio John E's Avatar
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    Jul 2000
    My Bikes
    1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
    22 Post(s)
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    I have aluminum 6-bolt 45, 46, 47, and 49T rings with 157mm BCDs. [I also have a 58T, for anyone who wants it for the $5 cost of shipping.] Looking at my 45T ring, I would guess 44T to be the minimum size, but I have never seen one.
    "Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
    Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
    Peugeot: 1970 UO-8, S/N 0010468
    Bianchi: 1981 Campione d'Italia, S/N 1.M9914
    Schwinn: 1988 Project KOM-10, S/N F804069

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