Sorry to answer a question with a question but do you mean the tires?
spokes
The wheels are the big round things on which the bike moves and the axles are at the center of the wheels, attaching them to the bike.
the things on both sids of each tire on a trick bike or bmx bike are called pegs
Cranks, or crank arms
You ride a bike by putting your feet on the pedals and then you go round and round, you need to keep your balance so you need to practice allot.
You can find them on a car tyre too, especially new ones. The rubber tyre is made from almost liquid rubber which is forced into the tyre mould, The little spikes allow the rubber to completely fill the mould.
poker cards and clothes pins
Try spoke cards.
A spinning bike, a stationary bike or an exercise bike.
Sky bike can mean too many things for there to be a sensible answer to this. From people riding bikes on tight ropes, to a company called skybikes building perfectly regular bicycles, to a kinda-sorta cablecar bike.
Slip the clutch.
Beat The Gym Then Use Cut In front Of That Spiky Building. Go Inside And navigate the Building To The Top Floor There Will Be A Boss That Uses poison Pokemon,m So Good Luck. (After Defeating Her You Will Get A Bike) Made By A Kid
Good information about the dirt bike is that you can ride them when they are not anything to do