This aluminium rear suspension mount is an optional upgrade for the 4WD YZ-4 chassis, built for the L5 suspension arm. The rear-side suspension pin spacing is 2mm narrower than the standard mount, a measured change intended to alter rear geometry without modifying the suspension arm itself.
Used as a matched set with the front-side rear suspension mount Z4-300LRF and the 1mm longer L5 arm Z4-008RS5, the arrangement lets you alter track width while keeping the longer arm length. On high-traction carpet or turf surfaces the mount can induce moderate chassis roll even with firmer springing, which can help the car turn more readily.
To further tweak front-to-rear balance, the mount can be combined with a 1mm longer front arm Z4-008F1 for additional weight transfer and turn-in refinement. These notes describe RC-scale parts and setup only.
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