LOSI PROMOTO-MX 7075 Aluminium Rear Swing Arm MX057A Chain Tension by GPM  [MX057A]

TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A
Price:
£60.57
Brand:
GPM
Model:
MX057A
GTIN:
4894538391176
Condition:
Brand New
1 Reviews
Write a review
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"
alt="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A" title="TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A"

Rear swing arm upgrade for PROMOTO-MX

Designed specifically for LOSI PROMOTO-MX bikes, this rear swing arm is listed as MX057A. Built from 7075 aluminium, the alloy component replaces the standard plastic arm to provide greater resistance to wear and improved dimensional consistency for off-road riding.

The assembly is prepared for oversized inner bearings and comes with the supplied 8x16x5 bearings for direct use with the hub interface. Fitting the alloy arm results in a slight change to wheel travel (noted as +1mm) and keeps compatibility with the original chain tensioner hardware.

Lengthwise adjustment of the arm allows quick chain-tension setup at the track. The provided hardware handles the basic bearing and mounting requirements so fitting should be straightforward for most hobbyists.

Packing includes

  • Rear Swing Arm - 1pcs
  • Bearing 8x16x5 - 2pcs
  • Grade 12.9 black Cap Head Screws 3x18 - 2pcs
  • 4.0 Lock nut - 2pcs
  • 3.0 Lock nut - 2pcs

Original Name / Part No:

LOS264000

Compatible Models

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

For those servicing a 1/4-scale PROMOTO-MX, the MX057A alloy swing arm offers a robust replacement with larger bearing support and simple chain-tension adjustment, supplied with bearings and core fasteners required for fitment.

 

Product Reviews
1 Reviews
rating
very impressed with your products . the alloy bash plate, sump guard , rear swingarm and knuckles [ball bearing throughout ] for my losi promoto all fitted perfectly . the machining is impeccable , no damaged threads or scratches . delivery in under two w

Is the part a direct replacement for the stock arm?

Yes, the arm is intended as a direct-fit replacement for the listed PROMOTO-MX model numbers; confirm your bike code against the compatibility box before purchase.

What maintenance should I perform?

Regularly check bearing preload and lock nuts after initial runs, and re-torque mounting screws to maintain correct chain alignment and longevity.

Will this affect sprocket alignment?

The design preserves the stock alignment method and chain tensioner, so sprocket alignment should remain consistent when fitted and adjusted correctly.

Copyright © 2008-2026 rcjaz.co.uk All rights reserved