Is it possible to set the stem / steerer higher in Cannondale R300? It feels like I need higher stack and I wouldn't like to tilt the drop bars from their current position.
Bonus question: are stem and steerer one single part here?
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This is a traditional quill stem, meaning it's shaped like a "7", with the vertical part fixed inside the steerer tube by a wedge bolt.
There should be an allen bolt at the top--it looks like it might be covered by a rubber plug here. Loosen that and give it a light tap with a mallet to dislodge the wedge. You should then be able to raise the stem. If you can't raise it as high as you want, you could replace it with a new stem that's taller.
Bonus answer: yes a quill stem does the same job as the stem, and the top-part of the steerer.
The lower part of the steerer tube is the top of the fork as per a threadless setup, but a threadded fork normally is only long enough to get out the top of the headset.
It is possible to get threadded to threadless adapters, and then fit a threadless stem. This allows longer or angled stems to be used, but may be heavier/uglier.