LOSI PROMOTO-MX Precision 7075 Rear Swing Arm MX057A by GPM  [MX057A]

TEAM LOSI DIRT BIKE PROMO-MX MOTORCYCLE 7075 Alloy Chain Tension Rear Swing Arm (Larger Inner Bearings) - GPM MX057A
Price:
USD$79.90
Brand:
GPM
Model:
MX057A
GTIN:
4894538391176
Condition:
Brand New
1 Reviews
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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"

Precision 7075 alloy rear swing arm for LOSI PROMOTO-MX upgrades

This MX057A rear swing arm is a purpose-built 7075 aluminium replacement for LOSI PROMOTO-MX platforms. The component offers improved dimensional stability and wear resistance compared with the stock plastic item while supporting larger bearing interfaces for enhanced load distribution.

The arm is configured to accept oversized inner bearings and the kit includes two 8x16x5 bearings to match the hub interface. Fitment results in a modest change to wheel travel (recorded as +1mm) and retains compatibility with the standard chain tension adjuster, enabling familiar adjustment procedures.

Lengthwise adjustability simplifies chain tensioning during tuning, and the supplied hardware addresses the typical mounting and bearing seating needs for a clean installation. The packing details and part numbering are retained below for reference.

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 advanced hobbyists seeking a durable bearing upgrade for the 1/4-scale PROMOTO-MX, MX057A delivers a precision-fit 7075 alloy arm with larger bearing support and an easy-to-adjust chain-tension arrangement.

 

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

Which models is MX057A compatible with?

Refer to the compatibility list in the compatible models box; MX057A is prepared for FXR-LOS06000 and FXR-LOS06002 PROMOTO-MX RTR units.

What bearing size and quantity are supplied?

The kit includes two 8x16x5 bearings which are the specified size for the hub pivot interfaces described in the product details.

Will I need any special tools to fit the arm?

Standard hobby tools and a bearing press or gentle seating method are normally sufficient; ensure fasteners are torqued to appropriate values and bearings are seated squarely.