RFX Pro Series Elite Aluminum Sprocket - 420 (manufacturer part number: FXRS 15-53 99RD): a sprocket dedicated to motocross, machined for the demands of off-road final drive. Made from 7075 aluminum using CNC machining, it combines lightweight construction with precision manufacturing for consistent performance on muddy trails or bumpy tracks.
- Material: CNC machined 7075 aluminum
- Color: anodized red, color code by model
- Number of teeth: 53 teeth
- Chain pitch: 420
- Design: lightweight CAD profile, mud evacuation grooves
- Finishes: laser-engraved RFX logo, tight tolerances
- Type: standard, optimized rigidity against torsion
The grooves help limit mud accumulation around the teeth and contribute to cleaner chain engagement. The CAD-designed profile and reduced tolerances aim to improve chain/sprocket engagement, while the anodization protects the aluminum and provides a track-visible look.
Common compatibilities: Honda CRF 150 R (2026), CRF 150 R Big Wheels 16/19 (KE03) 2022, and CRF 150 R Std Wheels 14/17 (KE03) 2020. Before installation, check the chain pitch and positioning on your sprocket to ensure proper final drive adjustment.
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