SUNCORD Magnetic Chain Supporter ⁣ for Brompton Bicycle G Line

For use with integrated external bottom brackets (BB) 

Ring thickness: 2 mm

Adjustable travel: 26 mm 

Available with 3 different lengths of carbon plates to choose from 
Compatible with 44T to 58T round chainrings (not suitable for oval chainrings).

Applicable models: Brompton, Birdy, and other vertically-folding bikes.

Installation Notes:

• The magnetic pulley must be within 4 mm — the key principle is that it should not touch the chain.

• The distance cannot be too far, otherwise chain drop may occur.

Working Principle:

When folding, the chain is automatically attracted and held in place, keeping it engaged with the chainring teeth and preventing slipping. This naturally creates an anti-drop effect for the chainring.
When the frame is unfolded, the chain automatically detaches from the magnetic pulley.
For best results, it is recommended to use together with the magnetic derailleur chain supporter.