Hi! Good buy! The Headset comes with the bike, so no worries... You will only need to buy the adapter if you are going to use the Trek's RCS Pro Blendr Stem. Then you will need to buy the Trek RCS Pro Blendr Split ring. (Except if you mean the stem/handlebar combo that i used...)
@@Stefanosinf ah that’s good news then heard it didn’t! I’m looking at running the dead Superbox stem but seems to be a bit of a minefield figuring out if needing a specific headset etc for the semi integrated look under the stem!
Better send an email to Deda, in case you will need anything more. (Also, there is a discussion going in weight weenies site about this subject, google it and you will find more answers than i currently have to offer...) It would be a bummer to got hold of the bike and stuck at the headset... I hope you enjoy your build, and come back if you want to drop a link so i can see the results!