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  1. #1
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    What type of cog will fit kid's coaster hub?

    Bike has a coaster hub with a cog retained by a snap ring. Which type of replacement sprocket should I be looking for (I see lots of type available -B-type, E-type, SA - but no dimensions)? The inside diameter should be be 29-30mm or 1 3/16".

    Shimano Nexus sprocket is too large (by about 5mm).

  2. #2
    coprolite fietsbob's Avatar
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    Jun 2010
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    3 spline snap ring cogs often followed the Sturmey Archer AW3 pattern.

    in 13 - 21t most 1/8" thick..

    [ FWIW, Sachs made a short cassette for hubs they supplied to Brompton
    with 2 3/32"Thk cogs, 13/15.. the 15t on those, 3 short gate teeth
    Fit AW3 hubs, I put 1 on my BSR Brommie.. ]

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