Still not sure what’s really needed. Is the player stabilising the bike (above) or is the bike supposed to stabilise itself? As in, the faster we go, the more difficult is to lean / tip it to the side.
Here’s some self stabilisation. This one is not using physics but can be adapted to work with it:
I whant to make self stabilize bike with leaning. But in fast speed velocity it’s not leaning and in low fps it’s starts to flip from one side to another. Also when bike is upsided down it rotates to up vector.