Brompton Thx4ride external 7 speed upgrade kit for A line C line 3-7 speed. 

Advance derailieur system on your brompton but dont like to get a T/ P Line?

No problem

This is a brand new bundle from Thx4ride for brompton A/C line 

Come with the rear derailieur, shifter (can support up to 7 speed), the chain tensioner and all fittings required

CNC Aluminum component for 

Free UK 1pm special delivery fully tracked and insured

Thanks for watching

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How to make it works?

1. without upgrading the wheelset? get a H&H 5 speed uni-body cog cassette for Brompton Bike - 11/13/15/17/22/25T it will fit your stock 2 speed/ 6 speed wheels

2. get a P/ T line rear wheel, removed the plastic guard, add a 10 speed 25T/26T/28T cog to make it 5 speed

3. get any 5-7 speed rear wheel set

*10 speed or above chain required for this conversion.

** new shifting inner & outer cable also required.