The hardness of the pulley plate wheel is represented by the letter A. The larger the value, the higher the hardness. Wheels at 101A and above are regarded as hard wheels. The soft wheels start at around 85A. Double warping is rarely useful to the softness of 78A. The big difference between the soft wheel and the hard wheel is in sliding. If you like the unique sound while sliding and still have some foot feeling, then choose the hard wheel. The advantage of the soft wheel in sliding is not that big. The sound, and it feels very soft, is just like standing on a sponge. The shortcoming is also obvious. The hard wheel has less friction, so you can just squeeze it over when you do some turning and turning movements. But the soft wheels may be unsatisfactory, which reduces the playability a bit, but considering the comfort on sliding is still good!
But in our country, there are not many people who have access to pulleys. Roller skating is more familiar to everyone. “Roller skating is turning ice, and pulley is turning snow.” The International Snow Federation introduced a special cartoon about pulleys. “Saw off the front and rear ends of the snowboard. Two wheels are the pulleys.” Same as roller skating, pulleys. The site requirements are not high, one road and one square are enough. “If you don’t have the conditions to do simulation training on land, it is very good to do simulation training on land, and you will not get hurt when wearing protective gear. Skateboard wheel manufacturers think it is very good for children.
Therefore, through the first-wheel frontal vertical impact and all-wheel vertical impact tests on the wheels of the sample shoes, it is tested whether the roller skates collide with the road protruding or jump to the ground during the first round of the movement, and whether the components are damaged or not when subjected to a large impact. Deformed. The first round of frontal vertical impact test is to fix the roller skates and a certain mass of weights on a swing arm to increase the strength of the impact, raise the swing arm and then make the first round of the roller skates frontally hit a vertical erection at a certain speed On the steel plate.