Traxxas TRX-4 Pendulum Wheel Knuckle Weight GPM023X 20pcs set by GPM  [GPM023X]

Precision brass pendulum knuckle weight for advanced crawling

The GPM023X brass pendulum wheel knuckle axle weight is CNC-quality brass hardware engineered to place mass low at the wheel hub for improved tyre contact during steep climbs and technical trails. The unit uses a central bearing and Delrin collar interface so the pendulum remains free to hang and concentrate mass at the tyre contact patch rather than on the upper knuckle.

The kit is supplied with multiple hex wideners, stainless pins, spring shims, metal washers, hex socket screws and 12x18x4 bearings to suit a range of crawler platforms. Use these components to tune the low-mounted mass and ensure correct axial alignment on the wheel hub for predictable handling.

Included items in the kit (as supplied):

• 31mm Hex Adapter for TRX4 - 2 pcs
• 21mm Hex Adapter for other models - 2 pcs
• Stainless Steel Pin 2x10 - 2 pcs
• 5mm Spring Steel Shims - 2 pcs
• 5mm Metal Washer w.opening - 2 pcs
• 19mm Stainless Steel Hex Socket Screws - 2 pcs
• Metal Washer for GMADE models - 2 pcs
• M4x2.5x11 Pin - 2 pcs
• 12x18x4 Bearings - 2 pcs

Key technical and fit notes taken from the manufacturer:

• The single pendulum weight is specified as 128 gram, not including the bearings and collars.
• Two hex widener sizes are provided: 31mm hex wideners intended for Traxxas TRX-4, and 21mm hex wideners for Axial SCX-10 I/II, GMADE Sawback family and HPI Venture 1165642.
• Wheels must have an inner diameter of 45mm and a wheel shaft hole of 5mm to be compatible with this kit.
• Installation location is on the outer case of the front and rear knuckle arms where this aftermarket part mounts to add mass not present on the original chassis.
• For TRX-4 use, insert the white Delrin collars on the rear side of the pendulum where there is a groove and secure the hex adapter with the supplied screw pin.
• For Axial SCX-10 I/II, GMADE Sawback/Sawback 4LS/Komodo and HPI Venture 1165642, press bearings on both sides of the pendulum and install the hex adapter directly onto the supplied steel pin.

Install these brass pendulum weights where controlled low-mounted mass improves wheel bite and chassis balance; follow platform-specific bearing and collar orientation and verify wheel ID and shaft hole dimensions before assembly.