If you're rolling downhill - gravity. If you're going along on the flat - the pedalling effort of the rider.
driveshaft
Yes, it would be possible to turn a regular bike into an exercise bike. The way that this is done, is by mounting the bike at a level where the wheels spin, but the bike does not move. You can do this by welding metal onto the bottom of the bike, and elevating it.
There are different sizes for dirt bike wheels as there are for regular bike wheels.
ENGINE
Thin wheels alone isn't enough to identify the bike type. Can be a road bike, bike, a track bike, a TT bike. Even fixies and single-speeds can have thin wheels.
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 wheels on the side of the direction of the turn.
these 2 wheels are very different. For one, a bike tire has an inner tube where a car tire does not. Also a car tire has steel belts and is made to a higher standard. Car tires are flat on the bottom to give the most traction where the bike tires are rounded because you must lean the bike to make a turn. The wheel itself works the same way however.
the energy transferred from out (levers) or legs to the pedals makes the gears of the bike spin a chain connected to the tiers there for making it spin.
Change the wheels with specil ski wheels i think its called ski bike.
The front wheels being moved by the steering wheels rotation. The direction that the wheels are pointing denote the direction that the car is travelling.
it has wheels