GRK RWD High precision ball bearing upper arm (various colors) (R31S329) Color:Purple if you change the hub

if you change the hub to the [R31W339] GRK brake rotor

convenience of tuning

Newbies may need help

Ultra Response Mode (SUR)4

using the 0 offset in rear = 73mm ~ using 3mm offset in rear = 83mm

GRK RWD High precision ball bearing upper arm (various colors) (R31S329) Color:Purple if you change the hub(R31S329)GRK RWD High precision ball bearing upper arm (various colors) Product description A new upper arm developed for GRK5 is now available as an optional part! Adopts a bearing support type that achieves both high support rigidity and ability to follow the road surface. By minimizing installation play, geometry changes due to input and vibration are suppressed. You can expect improved tracing performance at the front and traction performance at