What headset fits: 44mm headtube, tapered 1 1/8'' to 1 1/2'' steerer, internal bearings ?
None. You can have an inset upper bearing, but the lower will need to be external. There not enough space between a 1.5" OD diameter steerer and a 44mm ID headtube to get a bearing in there.
@Sumo started
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What headset fits:
44mm headtube,
tapered 1 1/8'' to 1 1/2'' steerer,
internal bearings
?