Find the exact bit I've misunderstood

I'm stuck on why a bike stays up when it's moving and I've half got it.

Here's how I currently understand it: I thought it was the spinning wheels acting like gyroscopes, but I read that bikes with the gyroscope cancelled out still balance, so now I don't know what's holding it up at all.
Where it falls apart: if it's not the gyroscope, what makes it turn back under itself when it starts to fall

Don't explain the topic yet.

First, ask me questions until you've found the exact point where my understanding goes wrong. One question at a time, and wait for my answer. Make them the kind of question that would give different answers depending on what I believe, not questions I can bluff.

When you've found it, tell me in one sentence what I've got wrong. Then fix only that. Don't re-teach the whole subject from the start, and don't explain the parts I already had right.

Then give me one case where my old understanding would have led me to the wrong answer, so I can feel the difference.

What you get: A few sharp questions, then a fix aimed at the one piece that was broken.