Traxxas TRX-4 Brass Pendulum Knuckle Weight GPM GPM023X  [GPM023X]

Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X
Price:
CAD$49.59
Brand:
GPM
Model:
GPM023X
GTIN:
4894538293050
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alt="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X" title="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X"
alt="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X" title="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X"
alt="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X" title="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X"
alt="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X" title="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X"
alt="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X" title="Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X"

Brass Pendulum Wheel Knuckle Weight for Trail Stability

Fit the GPM Brass Pendulum Wheel Knuckle Weight to add deliberate ballast to each wheel on the Traxxas TRX-4 and other compatible rigs. The added mass helps maintain tyre contact and steadier articulation when crawling technical terrain.

Packing includes

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

Original Name / Part No:

Same as original

Compatible Models

  • Traxxas TRX-4
  • Axial SCX-10 I & II
  • HPI Venture 116564
  • GMADE Sawback / Sawback 4LS / Komodo

How the pendulum weight improves contact

The pendulum uses a central bearing with a delrin collar so the mass sits narrow near the axle and flares lower on the wheel. This arrangement shifts weight down and out, letting the wheel trace irregular surfaces while reducing hop and bounce.

Specifications

  • Weight: 128 grams (excluding bearings and collars)
  • Hex Widener Size: 31mm for Traxxas TRX-4, 21mm for Axial and GMADE models
  • Wheel Compatibility: Inner diameter 45mm, wheel shaft hole 5mm

A practical upgrade for trail-oriented hobbyists wanting calmer handling and better grip on uneven rock and root sections.

Will this fit stock TRX-4 wheels without modification?

The kit includes a 31mm hex adapter for TRX-4 fitment; stock wheels that accept that hex will mount with no major modification. Check wheel inner diameter and shaft hole first.

Does the extra weight affect steering feel?

You may notice heavier low-speed steering due to added unsprung mass. Many builders counter this with slightly softer servo endpoints or steering dampers for smoother inputs.

Are bearings included and preinstalled?

The package lists 12x18x4 bearings included. They are supplied loose so you can press them in during assembly to ensure correct seating and orientation.

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