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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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Included in this Brompton gear upgrade kit is:
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.
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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