3/16 x 1/2 Revolution

The Revolution Series bearings are a low friction bearing with several options to help satisfy anyone's desire. What makes this bearing unique is that it has a rubber seal on one side while having a metal shield on the other. Rubber seals are great protectors against dirt but the price is that they offer a little more friction due to the tighter seal.

3/16 x 1/2 Revolution Halo bearing by Avid Racing Concepts is a popular bearing for Associated GT2 rear hubs and also used in common router applications.