Why is the speed the car has Electric Tricycle

Domestic market because consumers have not been able to appreciate the charm of the speed , so at this stage womens mountain bikes has not been widespread, but in Japan and Western countries shift is already very common ( 50% in the Japanese bikes are shifting car ) . Of course, the reason is that no maintenance . Recent new products as well as sensors and micro-motors Electric Bicycles through the computer to automatically shift the automatic transmission system .

Bicycle design Delaisse 1817

In 1766 , a group of monks in the repair work of Leonardo da Vinci manuscript in 1490 , I found the earliest prototype bike , but did not actually manufacture it, stopping only in the imagination stage. Frenchman Siv Mubarak on a rainy day , the streets were splashing through the mud wagon , which splashed his whim : wagon so wide , it should be cut down half of the carriage , four wheels front and rear wheels ...... into two . So in 1791 , the first aircraft to travel by "Trojan Wheel" car was born. This car has around two wooden wheels attached to the middle of the beam , a bench above the safe , like a toy. Zheliang "Trojan Wheel " Although neither the drive chain , nor steering, but generally considered to be the earliest human bicycle . In 1818, Germany look林人德Royce also making a car wheelers , he added a steering wheel to control the direction of the front wheels , you can change Womens mountain bikes direction. But when you still have to spend two pedal cyclists , pushing the car to roll forward . In 1840, the Scottish blacksmith Macmillan , on the basis of a wooden -wheeled Delaisse invention on improvements. He installed on the crank axle of the rear wheel , and then link the pedal crank and connecting the front and rear wheel are used iron , front large and small rear wheels. Such real people 's feet finally leave the ground , stepped on the feet alternately moving vehicle driven wheels rolling forward . In 1842, Macmillan ride this car one day to walk 20 kilometers . In 1861 , France Michaud and his son , mounted on the front wheel can rotate the pedal board, saddle rack in the front of the car above . They put the car dubbed the "bicycle " of James, and exhibited at the 1867 Paris Exposition . Michaud from Siv Mubarak until his son , Electric Bicycles making their bikes and modern bikes vary greatly , this bike without a chain of transmission can only be improved in order to improve the speed of the front wheels diameter to achieve, thus causing the vehicle pole high , the diameter of the front wheels even more than the average person 's height , cycling becomes a very dangerous sport , when the rider fell to the ground , it tends to hurt. Cycling truly modern form was born in 1874. British Luosong ingenuity on the bike fitted with chains and sprockets, turning the rear wheels used to push the car forward . 1886 Britain's mechanical engineer John Starley , from the perspective of mechanics, kinematics design a new bike style , fitted with fork and brakes , front and rear wheels the same size , in order to maintain balance and control into steel diamond frame , the first time the use of rubber wheels. Starley not only improve the structure of the bike , but also the restructuring of many tools used in the production of bicycle components for mass production and promote the use of bicycles has opened up a wide road , so he was later known as the "Father of cycling ." He designed bike models like the bike and today has been basically in agreement. In 1888, the Irish veterinarian John Dunlop , get inspiration from bovine heal Stomach swelling in his garden for watering the rubber tube into a round stick and hit enough air mounted on the bike , this is the pneumatic tire beginning. The pneumatic tire is pioneering a landmark in the history of the bicycle , which not only changed the riding performance bikes fundamentally improve the bike and use function .

Bicycle safety performance

Bicycle rider 's personal safety is an important issue , there are countries to develop appropriate standards . China promulgated safety standards include three aspects strength structural parts , brake brake performance and safety devices , including the strength of the former frame and fork assembly , the assembly of the handlebar firmly with fork , front and rear wheel strength .
① impact strength frame and fork assembly : There are two measurement methods. First, the drop weight impact test, the assembly is erected vertically , the top of the front fork 180mm 22.5kg Battery powered bikes disposal a hammer , a hammer impact on the permanent deformation of the assembly does not exceed 40mm, no naked eye crack ; Second, drop test , placing 70kg weights in the saddle at the component, its center of gravity moved to the vertical position of the rear axle , the free fall forward , repeat the test twice , without naked eye cracks. In addition, the frame and fork need for lateral load strength test , the load weight varies by model .
② handlebar assembly firmness and fork : The method is the handlebar mount fork, 25N · m of torque applied to the handlebars womens mountain bikes horizontal pipe ( usually test bars instead) , the handlebar can not rotate.
Before ③, the strength of the rear wheel : The method is to put the corrected wheel spokes and clamping flat , 178N force is applied laterally , one minute later , the permanent deformation of not more than 1.5mm.
④ brake brake performance: test method according to the vehicle 's transmission ratio is divided into two kinds. One is on the trip 5m 5m or more bikes , the specified test speed of 24km / h; another one is on the trip 5m below the car, the speed of 16km / h. There are two wet braking performance and analog dry rainy . In the test speed required before use , the brake , the braking distance is not greater than the dry 5.5m, wet braking distance shall not exceed 15m.
⑤ safety devices: a bicycle should be equipped with a bell or lights , but also a reflector ( commonly known as the back light ) . The reflector is by vehicle headlights or other external light source , the intensity of the reflected light enough to remind each other's attention to protect themselves. The reflector has a front , side and rear reflector 3 kinds . In front of the white, red rear , front lateral white or amber , rear lateral white or red , white or amber pedal .