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Brompton gear upgrade kit - 3 speed hub to 6 speed hub/derailleur



3 speeds not enough (Sturmey Archer or SRAM/Sachs) not enough? This kit upgrades your Brompton to 6 gears and with a wide ratio.

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Brompton 3 to 6 speed upgrade kit

Included in this Brompton gear upgrade kit is:

  • 1 x rear wheel with 3 speed Brompton Sturmey Archer wide ratio hub with 13T/16T sprockets fitted. This is the double walled rim introduced in 2013 - QRW3SS-BWR
  • Sprockets reference is QRSPRSTACK-BWR6 
  • Derailleur chain tensioner assembly QCTADR
  • Rim tape
  • Chain (QCHAIN100DR) - for use with 50T front chainring (standard)
  • Gear trigger (QGTRIGDRA)
  • Chain pusher assembly (QCHPUA)
  • Derailleur spring set and dog-leg (QCTSPGTRIGSET)

Summary of upgrade

The upgrade involves replacing the wheel, replacing the chain tensioner with the Brompton derailleur version, installing the chain pusher (effectively the derailleur for the Brompton), the derailleur gear cable and the shifter / trigger

In addition to this kit you will also need the gear cable - this is ordered seperately as there are 4 models depending upon the handlebar type (M, P, H or S) - these can be ordered by clicking on the "accessories" tab.

Brompton Q part code: QDRRETSET3->6BWR
Brompton part number: 9012091 

Note: Full (quite complex) instructions are included. If you want to check out in advance, please ask by clicking here. Or click on the download tab.

Frequently asked questions:

Q. Will this kit fit any Brompton?
A. No - this will fit Bromptons made after 2002 when the rear derailleur system was introduced
Please note: This will only fit newer (though 2002 is not that new any more!) Bromptons with the brazings in place to accept a 6 speed gear configuration - we will contact you to check before shipping.

Q. I am not sure of the age of my Brompton - is there a way to check compatibility.
A. Bromptons built after the introduction of the derailleur system have a hexagonal shaped fitting on the rear triangle. If you look at the document in the download tab, you can see in figure DR1 on page 2 what it looks like. If it's not on your Brompton then there is nowhere to fit the derailleur.

Q. I don't have the place to fit the derailleur to - is that the end?
A. If you still want six gears then it is possible to change the rear frame/triangle for a  new one - though this is a dealer only fitting option. 

Q. I already have a Sturmet Archer wheel - can I just upgrade the sprockets and derailleur without the wheel?
A. The BWR wheel has different gearing (the standard ratio gearing means that even if it were possible to add more than one sprocket then the gears would in effect overlap - meaning you wouldn't get the benefit) AND the driver (where the sprockets sit) is not wide enough for more than one sprocket.

Q. I have a 3 speed SRAM / Sachs wheel currently - is this kit compatible.
A. Yes - although it is also possible (normally) to upgrade the existing Sachs / SRAM wheel to 6 speed without the need for a new wheel - though the wheel is probably very old by now so the full upgrade may we worthwhile, and this 6 speed gives a wider range of gears than the SRAM / Sachs equivalent.


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Brompton gear upgrade kit - 3 speed hub to 6 speed hub/derailleur

Brompton gear upgrade kit - 3 speed hub to 6 speed hub/derailleur

3 speeds not enough (Sturmey Archer or SRAM/Sachs) not enough? This kit upgrades your Brompton to 6 gears and with a wide ratio.

Have a question?

6 Question(s) answered - see below

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    Answered questions

  • Asked by Stephen Ongley
    on 03/12/2018
    If my Brompton can be upgraded from a 3 speed to a six speed - my serial number is 0907116723 Answer:
    Hi - the answer from that age should be yes. We have added two pictures to the product - showing 3 speed and 6 speed setup. The chain pusher attaches to a brazing on the rear frame (this was introduced in 2002 so should be on your Brompton)
  • Asked by Adam Ginson
    on 29/03/2019
    How easy is it for a complete novice with limited tools to do the conversion myself? Are the instruction thorough, and how long (roughly) does it take to actually do the work given the above? Answer:
    Hi - this could take a couple of hours - the tricky part is setting up the derailleur and hub gear indexing. The instructions are not a step-by-step (maybe we should make one) - but for the individual parts (e.g. hub gear setup / 2 speed derailleur setup) - you can view the instructions to see if they make sense. Alternatively - if you are close enough - bring your Brompton to us and we can do the conversion.
  • Asked by Stuart Grattan
    on 08/04/2019
    Hi i have a single speed brompton do you do a kit for a 3 speed conversion ? Answer:
    Hi - we don't specifically, what you would need are the following: QRW3SS-SA - 3 speed rear wheel Gear trigger (type depends upon whether you have an integrated brake or not) Gear cable - also depends upon the trigger type QGCPULA - allows the cable to go around a corner just before joining to the wheel QGCABANC-SA - cable anchor - attaches the gear cable to the gear indicator chain (supplied with the rear wheel)
  • Asked by Ethan
    on 01/08/2019
    I have the 3 speed SRF3 and would like to upgrade to 6 speed.Do you sell the kit only without the wheel? Answer:
    The wheel is required - the SRF3 rear wheel can only take one sprocket - the Brompton BWR wheel is designed to take two sprockets - then works in conjunction with the Brompton derailleur to give 6 speeds
  • Asked by Henri Dufaux
    on 21/08/2019
    Do you ship to France? When will you have the kit QDRRETSET3-6BWR available? Answer:
    Hi - yes, we do ship to France We make the kit up depending upon what you need - black or silver wheel, and pre or post 2017 - when the gear trigger changed
  • Asked by Aaron Kohlbecker
    on 28/09/2019
    Hi, would you please give mir Information when the article is available again? My Brompton has 3 gears and I want to upgrade it Answer:
    Hi - if you order it, we will build it. The kit varies slightly depending upon the age of the bike. Pre and post 2017 use different derailleur gear triggers for example.

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