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Brompton sprocket stack for Brompton bikes with a 6 speed Sturmey Archer BWR rear wheel
The sprocket set kit includes chain guard, sprockets (13T and 16T), spacer and circlip
4 left in stock in stock
Warning: Last items in stock!
This is a kit of parts making the BWR sprocket stack for fixing to the Brompton / Sturmey Archer wide range (BWR) 6 speed rear wheel hub.
The BWR-6 sprocket set pack contains the following:
0.85mm nylon chain guard - splined (QCHGD-BB)
Note: The BWR sprockets have a 16 spline Shimano style fitting - so will not fit the SRAM / Sachs 6 speed wheel - for that you need the SRAM 6 speed sprocket stack which uses an ISO 3 spline fitting
The chain required for this sprocket set depends upon the number of teeth on the front chainring:
44 teeth - 98 link chain - QCHAIN098DR
50 teeth - 100 link chain - QCHAIN100DR
54 teeth - 102 link chain - QCHAIN102DR
Brompton Q part code: QRSPRSTACK-BWR6
Brompton part number: 9024162
Note: If you were looking for a higher gear - you could use the 12/16T combination (though this isn't strictly recommended by Brompton as it leads to some overlapping gears)
The Brompton BWR-6 sprocket stack is for the Sturmey Archer / Brompton developed hub used on the 6 speed Brompton folding bikes
Below is a picture of the Brompton BWR hub (with sprockets attached)
The BWR is actually an internally geared 3 speed hub, but as you can see from the above picture it has two sprockets (normally 13 tooth and 16 tooth) which work in combination with a proprietary Brompton derailleur system - giving 6 gears in total
The sprockets on the BWR hub use a Shimano style 16 spline shape on the inside - this means they will only fit onto the hub driver the correct side facing you (one of the 16 splines is wider than the others)
Below is a picture of a (slightly dirty - to show it is a real one!) BWR hub driver (where the sprockets fit to) with the sprockets removed - so you can see the Shimano style spline shape. The one on the top just to the right is wider than the others, ensuring that the sprockets can only be fitted the correct way around
The sprockets are held in place with a circle / C-ring
Tools required: Small flat-head screwdriver (no special tool is required)
The chain guard disk is fitted first, it is keyed so it will only fit onto the diver in the correct direction. It protects the hub from dirt coming off of the chain
Simply slide the chain guard disk onto the driver and push so it's snug against the spokes
The 16 tooth sprocket used on the BWR wheel is keyed for the Shimano splined system - which is good as it means that you can't put it on the wrong way around
The sprocket is 1.8mm thick and has an individual Brompton Q part code of QRSPR16DR-SHMNO
There is a small triangle on the sprocket which points to the large spline - making alignment a bit easier
It is the same sprocket as is also used on the 2 speed Brompton rear wheel
Below is a picture of the 16 tooth sprocket installed on the BWR wheel
Simply slide on the 16T sprocket so that it is snug against the chain guard disk
3/ Install the spacer
The spacer included with the kit is 2.2mm wide, and is not keyed for the driver (though in the past we have seen keyed spacers)
It fits between the two sprockets to keep them the correct distance apart for the derailleur to function correctly and to make the sprocket stack the correct total width to be held firmly in place by the circlip
The below picture shows the hub with the spacer now installed
Next on is the 13T sprocket. It is also keyed to prevent it being installed the wrong way around
The 13T sprocket is 3.1mm thick and also available as individual Brompton Q part reference: QRSPR13DR-SHMNO (Note: This Sprocket is not compatible with 3 speed Sturmey Archer hubs - BSR, AW, SRF-3)
Last up is the circlip (also going by various other names). It is just a piece of metal with a split allowing it to open slightly for installation onto the driver where it sits in a groove holding the whole sprocket stack in place
Simple but effective!
This is where you will need a tool (there are special circlip pliers, but a small flat headed screwdriver is sufficient)
The circlip is installed to sit in the groove on the driver
The picture below shows the circlip successfully installed - there will be approx a 5-10mm gap as shown
Now you are free to go ride your six speed BWR Brompton off into the sunset!