GPM Racing Medium Carbon Steel 32T High Speed Hub Chain Sprocket+40 Manganese Steel 68 Roller Chain for Losi Promoto-MX Motorcycle RTR FXR (MX6832S)

Precision 32T Sprocket and 68-Link Roller Chain

This precision drivetrain replacement is specified for LOSI PROMOTO-MX motorcycles and is sold as MX6832S. The kit pairs a CNC-friendly medium carbon steel 32T hub sprocket with a robust 68 roller chain in manganese steel, engineered for durability and serviceability in 1/4 scale dirt bike RTR final drives.

The components match the standard spur-and-chain arrangement used on PROMOTO-MX machines. Install the hub sprocket to the hub register and route the 68 chain across the sprocket and counter gear while checking radial and axial alignment. Adjust chain tension to manufacturer guidance and confirm consistent tooth engagement; use correct RC-grade tools and secure retainers for installation integrity.

Service and inspection: monitor chain elongation and tooth profile wear after initial running, lubricate sparingly with a suitable chain lubricant, and verify fastener torque as part of routine checks. This kit is offered as an engineered replacement and upgrade option, focused on fitment and longevity rather than marketing claims.

Packing includes

• Hub chain sprocket 32T – 1pcs
• Chain 68 roller – 1pcs

Original Name / Part No:

LOS262003,LOS262000

Compatible Models

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

Use the GPM MX6832S kit to replace worn sprockets or to fine-tune final drive ratio on LOSI PROMOTO-MX models, confirming fitment with the compatibility list before installation.

What tolerances should I check during fit?

Check axial runout at the hub register, sprocket concentricity, and chain alignment to the counter gear. Minor lateral adjustments may be required to eliminate binding.

How do the materials affect service life?

Medium carbon steel sprockets offer a balance of strength and wear resistance while manganese steel chains provide good fatigue life; regular lubrication and inspection maximise service intervals.

Any recommended setup for reduced wear?

Ensure correct chain tension, maintain a clean running environment, and avoid excessive shock loads. Replacing chain and sprocket together yields even wear patterns.

What inspection interval is suggested?

Inspect after the first few runs and then at regular service intervals depending on use. Replace components showing measurable elongation or significant tooth wear. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.