HT = Head Tube
Just to make sure it is 1" or 1 1/8" rather than some strange French measurement which will do your head in trying to find replacements....
http://www.sheldonbrown.com/gloss_ha-i.html#headset
@Aroogah started
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HT = Head Tube
Just to make sure it is 1" or 1 1/8" rather than some strange French measurement which will do your head in trying to find replacements....
http://www.sheldonbrown.com/gloss_ha-i.html#headset