The classic OG Kogel bundle and the perfect combination of performance + durability. Ceramic Oversized Derailleur Cage: Improves rolling resistance, shifting accuracy, and power transfer. Ceramic Bottom Bracket : Extremely reliable and efficient bottom brackets that increase bottom bracket stiffness. Optional "Gain Chain" Wax-Coated Chain : Our wax-coated chain improves drivetrain efficiency over a standard lube chain. *After placing an order, our team will work with you to configure your kit and determine the right parts for your bike.