420 MXZ Drive Chain

The RK 420 MXZ Drive Chain is designed for riders who want reliable power transfer and race-ready durability on smaller-displacement motocross and off-road bikes. Built from high-grade medium carbon alloy steel, the chain components are shot-peened and heat-treated to handle hard acceleration, landings, and repeated impacts—while the non-sealed design helps keep rotating mass and friction low.

To keep performance consistent over time, RK pre-stresses and pre-stretches every chain to support even load distribution and help reduce frequent adjustments. The MXZ series also uses chromoly steel construction with seamless rollers and bushings, plus oversized alloy pins for added strength—making it a solid choice for demanding track and trail use.

Key features:

• ✅ Pre-stressed & pre-stretched for equal load distribution and minimal maintenance
• ✅ Chromoly construction with seamless rollers/bushings and oversized alloy pins for strength
• ✅ Shot-peened & heat-treated components for durability under racing conditions

Benefits of use:

• 🔹 Race-focused performance: non-sealed design helps reduce drag for a responsive feel
• 🔹 More consistent fit over time: reduced initial stretch for fewer adjustments
• 🔹 Ready to install: includes a clip connecting (master) link

Technical specifications (as provided):

• 📌 Brand/Series: RK MXZ Series
• 📌 Size: 420 (Type: 420 MXZ)
• 📌 Links: 112
• 📌 Seal type: Non-seal
• 📌 Master link: Clip
• 📌 Material: Carbon alloy steel
• 📌 Tensile strength: 22.2 kN (4982 lb)
• 📌 Max displacement (off-road): up to 125 cc
• 📌 Max displacement (street): up to 150 cc
• 📌 Color/finish: Natural
• 📌 Vendor part number: 420MXZ-112-CL

Why choose this product/service?!
⭐ Built for serious motocross racers with durable, heat-treated construction
⭐ Designed to stay consistent with pre-stretching to help reduce ongoing adjustments
⭐ Practical install with an included clip master link for quick setup