Sunlite E81 E-Bike Chain – 5–8 Speed – 128 Links
The Sunlite E81 is an e-bike–rated chain designed for the higher torque and sustained loads common on electric bicycles. It’s built to last longer than standard chains while maintaining smooth, predictable shifting on multi-speed drivetrains.
This chain is typically chosen as a service replacement for commuter and utility e-bikes running 5–8 speed systems.
Key Features
• Diamond Hard Coating to reduce wear and increase surface hardness
• E-bike–specific construction for higher torque loads
• Chamfered outer plates and inclined bridge for improved shifting
• Deep inner waist chamfer for quieter operation
• Sub-punched pins for increased tensile strength
• Extra-long 128-link length for e-bike applications
Compatibility & Use Notes
• Designed for 5 / 6 / 7 / 8-speed drivetrains
• Chain size: 1/2" x 3/32"
• Link count: 128 links
• Intended for e-bike use
• Compatible with derailleur-based drivetrains
• Not compatible with single-speed or 9-speed and higher systems
Service / Ownership Context
E-bike chains experience more wear due to motor assist. Proper sizing during installation and regular lubrication are critical to maximize service life. Chain stretch should be checked more frequently than on non-assisted bicycles to protect cassettes and chainrings.
Fit & Use Signals
• Good fit for e-bikes using 5–8 speed drivetrains
• Good fit for commuters and utility e-bikes
• Good fit if you want longer chain life under motor load
• Not a fit for single-speed drivetrains
• Not a fit for 9-speed or higher systems