Finally. A phone mount specifically made for the Brompton folding bike.
Quad lock to Peak Design Adapter for Brompton
Brompton Quad Lock to Fidlock Vacuum Insert
Brompton Quad Lock Phone Mount with Universal Adaptor : Automotive
Brompton Quad Lock Phone Mount
Brompton Quad Lock Handlebar Phone Mounting Bracket
Brompton Quad Lock Phone Mount
Brompton Quad Lock Phone Mount - Just Ride L.A.
Brompton Quad Lock Phone Mount with Universal Adaptor
Quadlock Phone Mount, Brompton Phone Holder
QUAD LOCK Brompton Phone Mount – Bikeary Bicycle Lifestyle
For Brompton Stem Adapter for Peak Design Phone Mount
QUAD LOCK Brompton Phone Mount – Bikeary Bicycle Lifestyle
Brompton Phone mount
Brompton Quad Lock Phone Mount with Uni Adaptor - JV Bike
Brompton Quad Lock Phone Mount For T Line – With Adaptor - JV Bike