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Brompton BWR 6-speed sprocket set 13/16T

QRSPRSTACK-BWR6

Brompton

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

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We have 3 in stock

£10.25

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Brompton BWR 6 speed sprocket set (13T/16T)

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)
16 tooth rear sprocket - 1.8mm (QRSPR16DR-SHMNO)
Spacer - 2.2mm 
13 tooth rear sprocket - 3.1mm (QRSPR13DR-SHMNO)
Circlip / split ring (QRSPRCLIP)

Fitting diagram


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

This video from Brompton shows how to remove and replace the sprockets.

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)

Which hub / rear wheel is the BWR sprocket stack for?

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)

Brompton BWR hub

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

Picture of Brompton BWR rear wheel driver showing splines

Brompton BWR sprocket set installation

The sprockets are held in place with a circle / C-ring

Tools required: Small flat-head screwdriver (no special tool is required)

Installation sequence

1/ Install the chain guard disc

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

Brompton BWR hub with chain guard fitted

Simply slide the chain guard disk onto the driver and push so it's snug against the spokes

2/ Install the 16 tooth sprocket

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

Brompton BWR wheel with 16T sprocket installed

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

Brompton BWR stack with spacer installed

4/ Install the 13 tooth sprocket

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)

Brompton BWR sprocket set - 13T sprocket installed

5/ Install the circlip

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

Brompton BWR sprocket stack - circlip installed

Now you are free to go ride your six speed BWR Brompton off into the sunset!

Reviews

Grade 
13/08/2015

An annual replacement on my Brompton- along with chain

As always- fast service from BBikes- make sure you order a new chain as well because if the sprockets are worn the chain will also be past it's "use by date".

    Grade 
    12/05/2015

    Excellent Service Quality Parts

    Bought one of these when replacing my pre 2013 drivetrain with new spider version - make sure you order new chain, bottom bracket and sprocket set when making this retrofit upgrade

      Grade 
      27/03/2015

      Great Service

      I've had a few of these from Brilliant Bikes now. Easy enough to fit once you get the hang of the circlip. You can get a special tool but I always manage with a set of long-nosed pliers. Always quick delivery.

      • 1 out of 1 people found this review useful.
      Grade 
      27/01/2015

      good Brompton Parts

      doing 3500 miles or so a year I need spares! BRILLIANT ARE BRILLIANT

        Grade 
        20/01/2015

        Excellent quality and service

        I bought two sets of these along with a 100 link chain to replace one set on the bike and keep another set with a spare chain. They arrived quickly and in goods order. I was also given a pair of plastic gloves which were put to good use when I changed both chain and sprockets.

        Thanks to the team at Brilliant Bikes
        Lynn

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          Brompton BWR 6-speed sprocket set 13/16T

          Brompton BWR 6-speed sprocket set 13/16T

          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

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