Knees touching rib cage when riding in the drops A few weeks ago I got a used road bike, my first bike to have proper drops. I don't have previous experience with riding in the drops. I enjoy it a lot so far.
One thing I did however notice was that when I do, my quads and knees seem to touch my rib cage. Is this a problem / is there a way to tweak things so this does not happen? Or is it normal and/or fine as long as it doesn't cause problems? I guess it means I can't easily get more aero however for more of a hobby rider like me that is not that much of a concern.
In an aggressively aero position, it's not uncommon for your knees to be very close to your rib cage. For example, here is the first image I found on the web of a bunch of pros in the drops. Notice the first rider in particular is just about at the top of his pedal stroke and his knee is quite close to his chest. As long as your pedal stroke is not impeded, there's no problem, although many people find it uncomfortable to ride in such a position for a long time. If your back is not as flat as his, it is possible that your bike is not long enough, which can be remedied with a longer stem.
If you do find it uncomfortable, raising the stem slightly is an easy solution. If you want to keep the aero position, but need more room to have a proper pedal stroke, shorter cranks will reduce the height of your knee. You may also want to experiment with moving your saddle forward (and probably up at the same time to compensate) so that your hip does not have to compress as far at the top of the pedal stroke.