1/4 x 3/8 x 1/8 Flanged 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.
1/4 x 3/8 x 1/8 Flanged Revolution bearing by Avid Racing Concepts is the standard bearing for the RC10 Classic. Check your manual for the correct size for you vehicle if you are not certain.