The length of the saddle should be 24-30 cm, the distance between the central axis and the ground should be 24-30 cm, and the diameters of the front and rear wheels of the bicycle must be the same. The maximum diameter of the wheel is 70 cm and the minimum diameter is 55 cm. The bicycle used should be a dead flywheel, and it is not allowed to install a speed change device and brakes.
Site requirements
The surface of track cycling must be made of wood, and the track size is usually designed to be 250 meters and 333.33 meters. The track is oval and basin-shaped. The maximum safe speed range of the runway should be designed between 85km/h and110km/h.
The lower part of the runway is provided with a relaxation lane (blue zone) which accounts for 10% of the runway width, and a safety zone for athletes, coaches and referees in the last competition. On a site greater than or equal to 250m, the total width of the safety zone shall not be less than 4m. There is a black line with a width of 5 cm extending 20 cm in the blue area, and the size of the site is measured by the measuring line.
There is a red line with a width of 5 cm at the 70 cm extension line of the measuring line, which is a fast riding line. The blue line at 1/3 of the total width of the site is called the motorcycle riding line from the inner edge of the site. In front of the counter, a broadband consisting of a black line 4 cm in the middle and white lines 34 cm wide on both sides is the finish line. The red line in the center of the straight is the chasing line, and the white line 200 meters before the finish line is the starting line of 200 meters.
For the field lighting system, besides the necessary main power supply system, there must also be an emergency lighting system. During the Olympic Games, the brightness should be at least 1400Lux.
The electronic timing system includes a starter, an electronic timing board or photoelectric time detector, an electronic display board and a result processing terminal. The electronic display board should reflect the performance time of11000 seconds. And it can display athletes' rankings, sprint results and so on in time.
In addition, there are lap cards and electric bells to show the number of laps completed by athletes. The destination has a destination video system for destination decision and a public address system for the whole venue to hear clearly.
Refer to the above contents: Baidu Encyclopedia-Track Cycling Race, Baidu Encyclopedia-Track Cycling Race.