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  1. #1
    DNP is offline
    Join Date
    Mar 2011
    Portland, OR
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    1 1/4" - 1 1/8" asymmetric headtube and 1 1/8" steer tube

    My frame's lower headtube dimension is 1 1/4" and is designed for an integrated headset. Are there any shims to change the steer tube to 1 1/4" or reducer headsets that will accommodate this marriage of parts?

  2. #2
    Senior Member
    Join Date
    Apr 2009
    New Rochelle, NY
    My Bikes
    too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
    188 Post(s)
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    When you speak of 1-1/4" is that the nominal size or the actual size. If it's the nominal size, ie. for a tapered (stepped) steering column than I don't expect that you'll have an easy time finding a reducer, since the bearing sits directly in the frame.

    OTOH it shouldn't be too difficult to find (or make) a sleeve to fit the larger crown race, or possibly to find a crown race for the 1-1/4" bearing, with an ID to fit a 1-1/8" fork. So I suggest you focus your energy on enlarging the crown rather than reducing the lower head bearing. Start by contacting the headset maker, and seeing if they offer a reducing crown race as a stock item.
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