From Locked Up RC:
Our TRX-4 Black Steel Portal Knuckles help you add weight down low for a better overall COG.
Most drivers will tell you that adding some weight down low is one of the best ways to improve performance in your truck.
These knuckles weigh 88g but fit within the stock footprint.
These covers are compatible with stock Traxxas and Locked Up RC TRX-4 portal covers.
Includes 2 knuckles and 4 M2.5×7 screws.
#0811-TRX-4 – $45.99
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