The RK 420 MXZ is a race-ready drive chain built for serious motocross use, delivering strength with low maintenance thanks to pre-stressed, pre-stretched construction. Made from high-grade carbon alloy steel with shot-peened, heat-treated components and oversized alloy pins.
The RK 420 MXZ Drive Chain is designed for riders who demand dependable power transfer and durability in motocross conditions. Built from high-grade medium carbon alloy steel and engineered with chromoly construction, it helps you handle hard starts, aggressive acceleration and constant roost without compromising consistency.
To reduce break-in time and keep upkeep simple, RK chains are pre-stressed and pre-stretched for more even load distribution. Shot-peened and heat-treated components, plus seamless rollers and bushings and oversized alloy pins, add strength where it matters most—helping extend service life and improve reliability during racing and training.
