Product Detail 產品詳情 - Bicycle Cluster

Transmission Derailleur Chain Guide / Chain Catcher

CH-2GC ( ISCG / ISCG-05 / E-type)

Mr. Control (Fouriers)

Roller type design. (for double chainring)

https://www.mrcontrol-bike.com/product_d.php?lang=en&tb=1&id=1033