540 is recommended for "rock racers" and 2 speed vehicles

Track pieces are sturdy

Tekno TKR5071D +3mm Gun Metal Annodized Wheel Hubs with Pins (2)

and the failure is rarely immediate — corrosion works in over weeks and shows up as intermittent glitching that is maddening to diagnose

The Losi TLR231101 is a center diff fan mount built for the 22X-4

ARRMA ARA-2648 Gearbox Covers Shock Tower Outcast 8S Parts 540 is recommended for "rockThis ARRMA set provides the front and rear composite upper gearbox covers with integrated shock towers for the Infraction 223S platform. These parts do double duty: they seal the tops of the gearboxes against dirt and debris while carrying the upper shock mounting points taking suspension loads directly into the gearbox structure. Both front and rear pieces are included, molded from tough composite material with precision molded mounting points that