What is the size of bicycle tires?

? Because according to the size of the frame, the size of the bicycle wheel is different, and the common wheel size is 26 inches.

?

In 18 16, a German ranger named delaisse walked from this forest in the east of the village to another forest in the west of the village every day. He thought: if people sit in the car, stop and go, do whatever they want, isn't it very chic? Delaisse began to make wooden trolleys, which looked similar to those made by Sifrak.

However, handlebars are added to the front wheels to control the direction and change the forward direction. But when riding a bike, you still have to step on the ground with two feet, one by one, to push the car forward. When delaisse rode out to do experiments, he was laughed at by many people along the way. Nevertheless, he still likes this "cute pony and bicycle cub" created by himself very much.

Once, while delaisse was riding around, a carriage passed by. The driver laughed at him and said that his car was slow, so he said to the driver, "Do you believe my car is faster than your carriage?" So they made a bet. The journey is a round trip from the east to the west of the village. As a result, delaisse is faster than the coachman 1 hour.

1840, the British blacksmith Macmillan got a shabby "lovely pony". He installed a crank on the axle of the rear wheel, and then connected the crank with the front pedal with a connecting rod, and both the front and rear wheels were made of iron, with the front wheel being bigger and the rear wheel being smaller. When the cyclist steps on the pedal, the car will move by itself and move forward.

He was caught by the police and fined. The charge is "riding a bike savagely". 186 1 year, the French Michaux and his son were originally carriage mechanics, and they installed rotatable pedals on the front wheels; The seat of the car is mounted on the front wheel, so unless the riding skill is particularly superb, the handlebar will not be stable and will fall off.

They dubbed this two-wheeled vehicle "bicycle" and exhibited it at the Paris Expo in 1867, which opened the eyes of the audience.

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