GRK light weight knuckle stopper

This aluminum knuckle stopper was developed to accommodate modern geometry.
The aluminum material is lighter and the body is thinner than the standard knuckle stopper.
The shape has been revised to improve the turning angle.

A hexagonal hole has been provided on the bottom for easier maintenance. It can be used with conventional knuckles

as well as the lightweight aluminum knuckle V1 (R31S331) that was released at the same time .