Bike Accessory 5-speed Derailleur Chain Presser Gear Ratio 11-13-15-18-21
This chain presser needs to be used with the rear derailleur, and the For Brompton turntable derailleur cannot be used. Use 9s or 10s sprocket, gear ratio 11-13-15-18-21. 1 set of rear derailleur - screw lock chain press.