Venzo Bike Bicycle Adjustable Braze-on Front Derailleur Adapter Clamp 31.8mm - Walmart.com
Front Derailleur Clamp Adapter 28.6mm 29.6mm 31.8mm 34.9mm Braze On Degree For Java Minivelo Road Bike Folding Bike 2 Speed - Bicycle Derailleur - AliExpress
Campagnolo Front Derailleur Clamp On Adapter - Glory Cycles
Shimano Dura Ace Adapter Clamp For Braze-On Front Derailleurs TotalCycling.com
Front Derailleur Clamp Adapter 28.6mm 29.6mm 31.8mm 34.9mm Braze On Degree For Java Minivelo Road Bike Folding Bike 2 Speed - Bicycle Derailleur - AliExpress
OMNI Racer Front Derailleur Adapter Clamp Fit Dura Ace Ultegra 105: BLACK 31.8mm | eBay
Shimano SM-AD91 Clamp for Dura-Ace/Ultegra/105/GRX Braze-on Front Derailleur - bike-components