Brompton Advance Chain Catcher (Tooled Version)
for Brompton P & T Line 
 
This is a updated version (known as the tooled version) of the Brompton Advance chain catcher for P and T Line folding bike, with brass threaded inserts

The V2 Chain catcher has been fitted as standard to all Bompton folding bikes made after July 2023
 
It is available aftermarket and needed if you want to fit a 56t chainring to your bike.
The chain catcher is a small component that keeps the chain in place over bumps and potholes in the road
 
Note: Only bikes with 4 / 12 speed gearing systems need a chain catcher.
The chain catcher will only work with the four standard size of Brompton front chain ring
44T
50T
54T
56T