The 420 chain is a lightweight, high-strength roller chain used on most small e-motos and pit-style bikes. It has a ½ inch pitch (12.7mm), meaning the pin spacing is standardized for smooth power transfer between the motor and rear wheel. It’s narrower and lighter than larger chains, which helps the bike accelerate quicker and run more efficiently.
Built for smaller displacement and electric setups, the 420 chain is designed to handle moderate torque while keeping weight down. It’s commonly used on bikes like SurRon Light Bee, Talaria, and other 420-compatible builds where response and efficiency matter more than extreme load capacity.
It’s a non-heavy-duty chain (usually non O-ring), which means less friction and smoother power delivery, but it does require regular cleaning and lubrication to stay strong and last longer.
In short:
A 420 chain is a light, efficient drivetrain chain built for small electric motos, giving fast response, smooth engagement, and reliable power transfer when maintained properly.
