
EK/PBR 520M3 13/51 Chain Kit - Ultra-Light Sprocket by EK CHAIN: a specific kit for motocross riders who want to lighten the transmission without sacrificing strength. Designed for the demanding conditions of off-road riding, this kit combines a 520 chain with an ultra-light aluminum rear sprocket to reduce unsprung mass and improve the bike's agility during angle changes.
This kit prioritizes weight reduction and longevity in off-road use: chain treated to limit wear from abrasion and aluminum sprocket to reduce unsprung weight. Ideal for CRF 250 R (2007–2009) and similar motocross machines. Regular installation and maintenance recommended to maintain performance in competition or training.
Compatible motorcycles (examples):