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Sprocket RFX Pro Series Elite Aluminium - 428

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RFX Pro Series Elite Aluminium - 428 SprocketRef : RFX00421A / 1123237004

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Description
Compatible motorbikes
Questions and answers

DescriptionRFX Pro Series Elite Aluminium - 428 Sprocket

Product details :

Features

RFX Pro Series Elite Aluminum Sprocket - 428 (Manufacturer part number: FXRS 51-45 99RD)

Specifically designed for motocross, this RFX Pro Series Elite sprocket is CNC machined from 7075 aluminum to combine lightness and strength. Its red anodized finish and the laser-etched RFX logo give it a racing look, while the CAD profile reduces unsprung mass without compromising durability.

Material: CNC machined 7075 aluminum
Number of teeth: 45 teeth
Chain pitch: 428 (compatible with 428 sprockets)
Color: Anodized red, model-specific color code
Features: mud evacuation grooves, tight tolerances, rigid design

The evacuation grooves ensure better mud clearance to limit buildup on the teeth and extend the lifespan of the chain and sprocket. Designed for standard mounting, it is aimed at riders looking to replace their stock sprocket with a part specifically optimized for off-road use.

Common compatibilities (examples): KTM 85 SX 17/14 (2025), Husqvarna TC 85 17/14 (2025), GAS GAS MC 85 19/16 (2025). Check the pitch and number of teeth before installation.

Technical information :

Reference

RFX00421A / 1123237004

No transmission chain

428

Number of teeth (crown)

Type of crown

Standard

Number of teeth

45 teeth

Material

Aluminum