The frame is the main structural component of the bicycle. It connects the front and rear wheels, and supports the rider's weight. Frames are typically made of steel, aluminum, or carbon fiber.

Wheels

The wheels are what make the bicycle move. They are made up of a rim, spokes, and a hub. The rim is the outer edge of the wheel, and it is usually made of aluminum or carbon fiber. The spokes are the thin rods that connect the rim to the hub. The hub is the center of the wheel, and it contains the bearings that allow the wheel to rotate smoothly.

Tires

The tires are what actually come into contact with the ground. They are made of rubber, and they are designed to provide traction and comfort. Tires can be either smooth or treaded. Smooth tires are faster, but they are not as good at gripping the road. Treaded tires provide more traction, but they are slower.

Chain

The chain is what connects the pedals to the rear wheel. It is made up of a series of links, and it runs over the sprockets on the pedals and the rear wheel. The chain is what actually makes the bicycle move forward.

Brakes

The brakes are what stop the bicycle. There are two types of brakes: rim brakes and disc brakes. Rim brakes use pads that rub against the sides of the rims to slow down the bicycle. Disc brakes use pads that rub against a rotor that is attached to the hub of the wheel. Disc brakes are more powerful than rim brakes, but they are also more expensive.

Handlebars

The handlebars are what the rider holds onto to steer the bicycle. They are usually made of steel, aluminum, or carbon fiber. The handlebars can be either straight or curved.

Saddle

The saddle is what the rider sits on. It is usually made of leather, synthetic leather, or gel. The saddle can be either hard or soft.

Pedals

The pedals are what the rider pushes on to power the bicycle. They are usually made of plastic or metal. The pedals can be either flat or clip-in. Clip-in pedals require the rider to wear special shoes that attach to the pedals.