RFX Pro Series Elite Aluminum Sprocket - 428 (Manufacturer Ref: FXRS 55-40 99OR)
Designed for motocross use, this RFX Pro Series Elite sprocket is CNC machined from 7075 aluminum to combine lightweight and strength. Anodized in orange, it features the RFX logo laser-engraved and a CAD-designed profile that reduces mass without sacrificing rigidity.
- Number of teeth: 40
- Chain pitch: 428
- Material: CNC Machined 7075 Aluminum
- Color: Anodized Orange
- Type: Standard
The mud evacuation grooves facilitate cleaning and limit clogging between the links, while tight machining tolerances promote a more precise chain engagement. The rigid design aims to withstand the demands of the final drive on challenging off-road terrains. RFX color codes its sprockets according to the motorcycle brand and also offers a standard silver version for certain models.
Compatible with compact motocross machines and particularly suited for small-displacement 85cc bikes, examples include:
- KTM 85 SX STD WHEELS 17/14 (2025)
- HUSQVARNA TC 85 STD WHEELS 17/14 (2025)
- GAS GAS MC 85 19/16 (2025)
Check the chain pitch and number of teeth before installation to ensure compatibility with your sprocket and chain.
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