The bicycle is a two-wheeled, steerable machine that is pedaled by the rider. It is used for exercise, sports (called cycling), and for transportation. Bicycles are very popular and are seen in many countries around the world.

The word bike is derived from the ancient Greek words bi- and kuklos, which mean “two” and “circle,” respectively. This gives the word a unique meaning and explains why bicycles are often called bikes.

A bicycle is a bicycle, or bike, that has two wheels set in a frame and a seat for the rider. The bicycle is steered by the rider’s feet on pedals that are connected to a chainwheel and sprockets that transmit power to the back wheel.

Bicycles are very easy to ride, and they can be ridden at very high speeds. This makes them ideal for riding long distances.

Some bicycles have a coaster brake, which allows the bicycle to stop automatically by pedaling backward. Other bicycles have hand brakes, which are controlled by levers on the handlebars. The hand brakes are operated by squeezing the levers.

Most bicycles have a gear, which allows the rider to change the speed at which the bicycle travels. Higher gears allow the bicycle to go faster but may require more effort to pedal. Lower gears make the bicycle go slower but may be easier to pedal.

There are many different kinds of bicycles, and they have many features. Some have multiple gears, so the rider can change the speed at which the bicycle travels as the weather changes or when riding on different surfaces.

The most common types of bicycles are road bikes and mountain bikes. The best type of bike to buy depends on your needs and fitness level.

For example, if you want to ride on flat terrain and are planning to participate in group rides with friends, a road bike is the way to go. These bikes are designed to be very light and aerodynamic, and they feature sturdy frames and attachment points for racks, fenders, water bottles, pumps and lights.

If you’re looking to get into cycling for the first time, talk with your doctor before beginning an exercise program. You could have health problems, like cardiovascular issues, joint or balance issues, COPD, diabetes or other breathing problems that can make cycling unsafe for you.

You might also need to wear a helmet, since this can help protect your head from injuries or accidents. A helmet is required by law in most states.

It’s also a good idea to invest in an extra-long handlebar so that you can see over the top of the bike and watch traffic. This will help you stay safe and ensure that you can avoid collisions with cars and pedestrians.

There are many different bicycle models available, and they vary in price, quality and style. There are even bicycles that are made of recycled materials, such as wood or aluminum, which reduce pollution and save the environment.