Review on Stylrtop Aluminum Bearing Derailleur Pulleys by Albert Bohimia

Just liked the uploaded video. The jockey wheel pulley grips the chain. The wheels do not play well with the chain. What I noticed is that the tooth width is wider than my standard Shimano derailleur gears. I think this is her downfall. In fact, you can see that all other road wheels advertised have narrower tooth widths. The width of the teeth on this pulley fits snugly between the chain rollers and prevents the chain from slipping off the pulley. If the width of the teeth were less than standard teeth, they would probably work just fine. The vibration created when the chain catches on the wheel is bad for the pulley bearings. I don't recommend it at all. I give them zero. I wasted my money.