RK’s MXZ4 chains are made for supercross and motocross racing. MXZ4 chains feature chromoly steel construction with seamless rollers and bushing. RK’s Chromized pins drastically improve the wear resistance more than two times compared to normal non-sealed chains while absorbing shock loads from extreme jumps. All components are heat treated using RK’s exclusive HIT (Heat Induction Transfer) process. 520MXZ4 has a maximum tensile strength rated at 8,000 lbs and is suitable for professional level 125cc to 500cc class racing. MXZ4 technology is also available in 420 and 428 mini bike pitch sizes.
The updated model is 520MXZ5. MXZ4 and MXZ5 connecting links are NOT interchangeable. You must use MXZ4 connecting links with MXZ4 chain and MXZ5 connecting links with MXZ5 chains only.
RK 428MXZ4 specifications
- Tensile Strength: 6,400 lbs
- Max CC Rating: 150cc Off-road
- Weight: 2.21 lbs
- Max Horsepower: 40 HP
- Master Link Included: Clip type
- Max Chain Width: 20.2mm
- Not recommended for street use
Anti-stretch chromium pin treatment 10% higher tensile strength
