The JR-TT102-LB is an aluminum rear hub / knuckle arm made for use on Tamiya TT01, TT01E and TT01ED chassis in RC scale. The unit swaps in for the stock plastic knuckle and uses a light blue anodized finish to improve rigidity and resist wear where steering and suspension link to the hub.
Installation uses the stock mounting points and hardware while maintaining the original geometry so alignment and toe settings are intended to remain unchanged after fitting. This allows an upgrade to metal strength without altering the car's handling baseline.
Notes for hobbyists: an aluminum rear hub reduces wheel-end flex and can sharpen steering response during cornering while making rear suspension feedback more consistent. Inspect bearings and fasteners at installation and use thread-lock on steel screws where appropriate.