They use a standard 608 skate bearing and are rated for heavy loads. The bearing isn't as quiet as a spinner, but it spins just as easily as a skateboard or roller wheel. I used them as support and guide rollers for a mobile cable system such as B. used a reduced chairlift. I also looked at some of the larger diameter white pulleys, but they had a deeper groove with vertical sides that prevents the rope suspension arm from running through the two vertical support pulleys and the horizontal main drive and idler wheels while maintaining the arm at the same angle clamps on the rope.
Bearing 608- ZZ1MC3E (8x22x7) NSK//80018
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