Join Date: Apr 2009
Location: New Rochelle, NY
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
Mentioned: 35 Post(s)
Tagged: 1 Thread(s)
Quoted: 1406 Post(s)
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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