The precision ball bearing - - - - - - The unique design, and conform to the German industrial standards ( DIN) Single rotate precision ball bearing is a bearing of the highest quality models. With the ball bearing wheel even carrying the maximum load, remained very low rolling resistance. The stability of the one-way wheel is better; Universal wheel and effort, requiring only on the road. Tapered bearing - Cone bearing is one of the most important part of the roller bearing. Compared with the ordinary bearing, their special advantage lies in expanding the use of pu castor field, will also be able to provide the moving characteristic of improvement. Is really depends on their own journey purposes, usually I use universal wheel, because it's effort, one-way I used before, sometimes feel no universal convenience, as for the wheels? Can only say that they see careful, choose those made in reliable manufacturers. The ordinary bearing - Wheel bearing is the most simple form of sliding bearing or friction. They can earthquake, little maintenance, and on the basis of the characteristics of materials, corrosion resistant. If the device only in the case of short distance, low speed movement. As you all know, the supermarket is the public, so for the castor mute requirements is relatively high. / news_146。