I honestly don't know this...I'm looking for one on my bike but all I see is stem, steerer, and a cap with a socket screw that goes into a stamped star-shaped nut of some kind. Is that the headset?

the headset is a set of parts.

here....

https://en.wikipedia.org/wiki/Headset_(bicycle_part)

it's the bearing assembly that allows you to steer the handlebars.

they're hidden campagnolo style on a caad9

Ok thanks all.

Does the fact that the CAAD9 has an integrated headset make it easier to work on that area, because the stuff doesn't fall out all over the place? i.e. changing stems, forks stuff like that?

Headsets are the new hype item. The pushy salesman at the LBS will tell you that you absolutely have to have a headset. Elitists will look down their noses if you deign to ride their bike paths on a bike without a headset. But here's the dirty little secret: a headset is just wasted weight. Sure it's a little extra bling, but it's also a little extra mass - remember, "chrome don't get you home." Headsets don't make you go ANY faster! They provide no propulsive force! Next time you are out shopping for a bike, and they start going on and on about the headset, RUN don't walk away...

"What does a headset do?" NOTHING! Except feed the smugness of elitists and drag down the speed of suckers.

Phantoj.. although I agree with you on road bikes, being able to run a larger steerer on a mountain bike is a pretty significant advantage. Reducing flex in the fork and providing a larger bearing surface to spread out the force especially downhill.

Just a thought.

Campagnolo style?

Campagnolo make 3 types. Traditional threaded headset, Hiddenset and Threadless.

satire.

that would be the difference between cartridge bearings and loose bearings. almost all new headsets of any style you can get now are cartridges, or use a carrier.

headsets aren't subject to the same loads hubs go through, so lose the loose bearings and get a retainer or cartridge.

hidden.

you typed all that out?

It seemed funnier in my head. Too much coffe this morning, I guess.

Don't worry coffee goes well with fail and facepalm.

I assumed it was a direct take-off (with the appropriate words changed out) of some other post. It gets the cynical, anti-salesman style exactly correct but takes it to the absurd extreme of suggesting you don't need a headset to ride a bike because it's just bling.

For what it's worth, I laughed.

In a roundabout way it reminded me of this post:

I am new: stupid question

"Is it smart to use loctite from prevent my pedal from floating/spinning?"

Also refers to the angle of the contact bearing surface. Different angle than Aheadset/Cane Creek style.

That picture is nice, but somewhat amusingly excludes the most important part of the headset... the bearings.

It looks like it's supposed to be showing a cartridge headset with the bearings pressed in, but that's not so easy for a reader to understand as a cup-and-cone headset, in my opinion, where you actually see the moving parts.

Wikipedia's drawing of a threaded cup-and-cone headset may be easier to understand:

those are all great, but they're not hidden headsets.

https://www.parktool.com/repair/readhowto.asp?id=68

So long as the front wheel is resting on the ground, nothing is going to "fall out" when you change the stem, no matter what style headset you have. There will be some loose pieces if you pull the fork completely out though.

Basically, there are two big variations on headsets; threaded and threadless. Threaded is the old style, where the stem is an "L" shaped piece that disappears into the headtube of the bicycle frame. Threadless is the new style. There are a couple variations on the threadless style (hidden, integrated, etc) that were designed to save a few grams over the other variations.