EK CHAIN JT 520SRX2 13/50 - Ultra Light Rear Sprocket Chain kitRef : EKC03837A / 3068664

EK/JT 520SRX2 Chain Kit 13/50 - ultra-light sprocket: a transmission set designed for motocross, focusing on the balance between durability and weight/value ratio. The SRX series is known for its consistency and regular improvements, making it ideal for riders looking for a reliable chain on track and off-road.

• Pitch: 520
• Sprocket / Sprocket: 13 / 50 (ultra-light sprocket)
• Number of links: 116
• Sprocket material: Aluminum (ultra-light version to reduce weight)
• Chain color: Steel / Steel
• Weight: 1.54 kg for 100 links
• Relative lifespan: index 3300 (comparative measurement on 100 links)
• Manufacturer reference: Not disclosed

This EK CHAIN kit is aimed at lightweight medium-displacement motocross and enduro bikes — original mounting or replacement depending on adjustment. The ultra-light aluminum sprocket reduces unsprung weight and enhances engine response without compromising the chain/sprocket interface. To ensure longevity and safety, regularly check the tension, lubricate as recommended, and replace the chain, sprocket, and sprocket simultaneously if necessary.

Notable compatibility: BETA RR 350 4T X-PRO (2026), BETA RR 350 4T RACE (2025), BETA RR 350 4T RACING (2024). Be sure to check the number of links and the sprocket/sprocket ratio before installation.