Octalock Spur Gear, 87T 48P The new Octalock spur gears, launched with the RC10B74.1 buggy, introduces the latest spur gear design from Team Associated. In addition to the octagon shape, each pad has eight locking tabs that engage with the spur gear for maximum security and longevity. This 87T is the latest variant to be released per requests from the drag racing community. This item fits the following: RC10B4 RC10B4.1 RC10B4.2 RC10B5 RC10B5M RC10B6 RC10B6 Club Racer RC10B6.1 RC10B6.1D RC10B6.2 RC10B6.2D RC10B6.3 RC10B6.3D RC10B64 RC10B64 Club Racer RC10B64D RC10B6D RC10B74 RC10SC6.1 RC10SC6.2 RC10T6.1 RC10T6.2