Brompton Replacement SACHS/SRAM 6-speed sprocket set 13/15
This is a workaround we have found works for this wheel as the Brompton stack was discontinued
This will allow you to keep your old SACHS / SRAM 6 speed wheel working for longer
The original Brompton sprocket stack (that's the cogs and spacers) for a SRAM / SACHS rear wheel has been discontinued, so we worked out a solution that works and that is what's in this pack!
This sprocket stack should be used with a 3/32" chain (QCHAIN098DR on 44T front, QCHAIN100DR on 50T front and QCHAIN102DR on 54T front). We recommend changing the chain when changing the sprockets and vice versa.
Not sure if this is the right one for you then check out below?
Contents of the packet
This set comprises the following kit for fixing to the Brompton / SRAM six speed rear wheel:
- 15 tooth rear sprocket - HSL945
- Sprocket spacer - 1Z8 0700
- 13 tooth rear sprocket - QRSPRSTACK-SA3-13
- Circlip - included with the above
When you install we recommend you use your current dust cap
What's a Circlip?According to Wikipedia: A circlip (a combination of circle and clip), also known as a C-Clip, Seeger ring, snap ring or Jesus clip is a type of fastene or retaining ring consisting of a semi-flexible metal ring with open ends which can be snapped into place, into a machined groove to permit rotation but to prevent lateral movement In the case of a Brompton wheel, it is used to hold the sprocket set in place. This is quite useful as it means no special sprocket tool is required. |
How do I know it's a SRAM / SACHS rear wheel?
And what is a SACHS / SRAM rear wheel
In approx year 2000, and not related to the mythical millennium bug - Sturmey Archer (who were supplying Brompton rear wheels) went bankrupt - before later being taken over by Sunrace and renamed as Sunrace Sturmey Archer
So for a short period SACHS - a german manufacturer of hub gears - hubs were used on Brompton bikes. To further confuse the issue, during this period SACHS were taken over by SRAM (the US bicycle component manufacturer)
The SACHS rear wheel is clearly labelled on the non (opposite to sprockets) drive side of the hub
Brompton SACHS rear wheel showing manufacturer marking
Tools required:
- Flat bladed screwdriver for removing / installing the circlip
- 15mm spanner for rear wheel removal
Step 1 - Put on the plastic chainguard - please use your existing one
The chainguard just slides over the driver and sits nice and snug against the spokes - it is not keyed. Hollow side against the hub
Step 2 - install the larger - 15 tooth - sprocket
The sprocket set comes with two sprockets (the 6 speed combines a 3 speed internal hub gear and two sprockets to give a total of 6 gears)
The larger sprocket has 15 teeth, it is available separately as HSL945
The driver has 3 grooves in it - which should be lined up to allow the sprocket to fit
Step 3 - install the sprocket spacer
The sprocket spacer is 1mm wide and keeps the two sprockets the correct distance apart for the Brompton derailleur to function correctly
The spacer is not keyed
Step 4 - install the smaller - 13 tooth - sprocket
The smaller sprocket is the smaller in size. It also has a flange / step on it. This should be facing towards the hub of the wheel.
It is keyed so has to line up with the three grooves on the driver - like the 15 tooth sprocket
Step 5 - install the circlip
This is the trickiest part of the procedure
All of the sprocket set is now fitted and the circlip has to sit snugly in the groove near the outside of the diver. This is what holds the sprockets in place.
Prise the circlip onto the driver using a flat blade screwdriver - ensure it is sitting properly in the groove. There will be a 5mm-6mm gap where the circlip would otherwise join
You are now ready to install the wheel and ride off into the sunset
We made this video to show how to install it:
The cover of the discontinued parts are as follows:
Brompton Q part code: QRSPRSTACK-SR6
Brompton part number: 9024216
These numbers are just retained for reference and to help you if this is what you have ordered in the past