Promoto-MX Precision Rear Swing Arm 7075 MX057 by GPM  [MX057]

TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057
Price:
USD$74.90
Brand:
GPM
Model:
MX057
GTIN:
4894538376586
Condition:
Brand New
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alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE Aluminum 7075 Rear Swing Arm (Larger Inner Bearings) - GPM MX057"

Precision rear swing arm for Promoto-MX

This aftermarket rear swing arm is an RC-scale replacement engineered for LOSI Promoto-MX motorcycles, CNC machined from 7075 aluminium to increase torsional rigidity versus stock plastic components. The geometry accepts larger inner bearings of 16x8x5 to reduce pivot play and maintain chassis alignment under higher torque loads.

Manufactured as a direct-fit upgrade for Promoto-MX rear swing assemblies on compatible LOSI 1/4 platforms, the arm installs using standard RC workshop tools and routine rear teardown. Technicians should confirm bearing orientation and seating before final assembly since the part is configured for the larger inner bearing dimensions referenced above.

Packing includes

  • Rear swing arm - 1pcs
  • Bearing 8x16x5 - 2pcs

Original Name / Part No:

LOS264000

Compatible Models

  • LOSI-1/4 PROMOTO-MX MOTORCYCLE RTR, FXR-LOS06000
  • LOSI-1/4 PROMOTO-MX MOTORCYCLE RTR PRO CIRCUIT-LOS06002

Use this precision 7075 aluminium swing arm when upgrading Promoto-MX rear pivots for higher stiffness and repeatable alignment; validate bearing choice and clearance during fitment to suit intended track or terrain.

What machining tolerance should I expect from this part?

The arm is CNC machined from 7075 aluminium to tight hobby-grade tolerances for reliable fitment; inspect mating surfaces and bearing bores during installation for correct seating.

Why are two different bearing sizes mentioned?

The product accepts larger inner bearings 16x8x5 to reduce pivot play, while the packing list supplies two 8x16x5 bearings; verify your required inner diameter before final assembly and replace bearings if necessary.

Any installation recommendations for technicians?

Use a controlled bearing press or drift to avoid seizing, confirm perpendicular seating, and check pivot free-play after assembly; re-torque fasteners to spec and verify chain alignment.

Is this intended as a race upgrade or hobby replacement?

The arm is aimed at hobbyists seeking improved durability and stiffer pivot control; its 7075 construction supports more aggressive riding and tuning compared with stock plastic arms.