GPM GPM023X Brass Pendulum Wheel Knuckle Weight Technical Kit  [GPM023X]

Brass Pendulum Wheel Knuckle AXLE Weight + 21mm Hex Adapter - 20pc set - GPM GPM023X
Price:
USD$36.00
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"

Precision Brass Pendulum Knuckle Weight for Enhanced Stability

The GPM Brass Pendulum Wheel Knuckle Weight is machined to add calibrated mass to each wheel end for the Traxxas TRX-4 and multiple compatible platforms. Its bearing-supported pendulum and delrin collar concentrate weight below the axle line to improve tyre contact and permit greater crawling angles without restricting rotation.

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

Engineering notes and application

The design utilises a central bearing and a delrin collar to allow a pendulum effect that is narrow at the hub and wider at the rim. This shape lowers the centre of gravity at the wheel while allowing the mass to pivot freely, improving ground contact geometry without adding binding forces to steering links.

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 precision upgrade for builders focused on measurable improvement in crawl performance and stability using CNC machined components and robust hardware.

What materials and tolerances are used?

Brass weights are CNC finished with delrin collars and stainless hardware. Bearings are standard 12x18x4 units; check press fit tolerances during assembly for optimal rotation.

How does this affect suspension tuning?

Added unsprung mass changes dynamic response. Consider softer spring rates or adjusted damping to maintain desired articulation and to avoid overloading small bearings or shafts.

Are upgrade bearings and spacers recommended?

High quality sealed bearings and properly sized shims improve longevity and reduce play. Use the supplied shims and washers to fine tune fitment for specific wheel offsets and axle types.