Joined: Jul 2015
Posts: 7,494
Likes: 3,296
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
that's a standard.Cane Creek 40 headset. Very common.
can you measure your fork steerer accurately?
if so, you will have all the info you need.
the 40 and 55 are the IDs of your frame's head tube.
"ZS" stands for "Zero Stack", also known as a "Semi-integrated" headset, IIRC
there are headset kits that allow using a straight steerer fork in a tapered head tube, but they are not common in a "new install" situation....