New 1/2 weight hubs are the perfect compramise between needed unsprung mass and weight. Each hub weighs in at 35g and is 100% bolt on for B6.2, B6.3 and B6.4. These hubs are recommended for medium/high grip surfaces or stock class racing. 
 
 
For B6.1 applications please purchase: ASC92180 + (2x) 6x12x4mm bearings
 
For DR10 applications please purchase: ASC92180 + ASC91605 + (2x) 6x12x4mm bearings  OR ASC92180 + ASC91859 + (2x) 5x12x4mm bearings. 
 
 
Bearings can be found on (https://rcspeedsecrets.com/) and sold in pairs (QTY 2) and also on (https://www.amainhobbies.com/) by searching "6x12x4mm bearing" or "5x12x4mm bearing"