>>28620420
bicycle will help a little with the balance, and 2 wheel sorta stuff yeah, but some of the fundamentals of turning a motorbike are different from turning a bicycle, due to the weights and wheel sizes etc

cars? not really, with a manual car youre doing clutch with foot and gears are up in different directions, on a bike its clutch with your hand gear with your feet, 1 down, 4-5 up (or flipped with a race shifter)
maybe the car speeds would prepare you for riding in traffic, but in a car youre 3-4x the size of what a bike takes up on the road so you probably wont learn much about road position