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Quite a few of the Bompton spare parts require you to know which wheel or hub you have (spokes, sprocket sets for example)
Here will will try and help you to identify what you have
Brompton no longer supply hubs as spares for the front wheels - and the wheel itself is so reasonably priced that by the time a hub / wheel is rebuilt, its cheaper to buy a new wheel (sorry!)
There are three types of front wheel as at the beginning of 2021
Other previous wheels include (please let us know if we have missed one)
It is held in place with normal wheel nuts
It is radially spoked - i.e. all the spokes come out directly from the hub without crossing another spoke at any point
It is available in silver or black (the black wheel still has a silver braking surface and silver nipples with the black spokes)
The super light front wheel is held in place with a bolt through Allen key rather than traditional wheel nuts
Older ones had a red colouring on part of the hub
These wheels are laced in a two cross pattern
Some older versions were radially laced - some wheels laced in this pattern developed cracks at the edge of the hub
It is lighter than the standard front wheel - though you won't know unless you have both wheel types - so not much help in identifying
The SP (short for Shutter Precision - as they started as a camera equipment company) SV-8 hub dynamo (so built into the front wheel) was the replacement for the Shimano hub dynamo.
This hub/wheel has been supplied in black (originally for the BLACK Edition Brompton folding bikes) and silver (for standard Brompton folding bikes) - from SP it is also available in red, though this was never fitted to Brompton bikes by Brompton themselves
It uses a bolt through axle the same as the super light front wheel (these axles are interchangeable) - the bolt is black on black edition bikes and silver on standard bolts
The hub includes arrows showing the direction of rotation. The hub itself comes in silver or black to match the rim / bike (the hub is also available in red - though this is not sold by Brompton)
It uses a tab connector (interchangeable with the tab connector used on the Shimano hub dynamo system) to connect the hub to the wiring loom
This wheel is very light - and the hub is very shiny
It uses two spade connectors to connect the hub to the wiring loom (cable)
Above is a picture of a SON hub dynamo fitted to a B75 (without the wiring loom connected)
The wheel is held in place by a bolt through axle as with the super light front wheel
As at the beginning of 2021 there are four rear wheels available
The single speed and two speed rear wheel used on Brompton folding bikes is the same wheel - just with a different sprocket stack
The real identification is that it doesn't have a thick hub (containing hub gears) - so the hub is much thinner / lighter. this is the least seen hub on Brompton folding bikes
The single / one speed - uses a spacer/sprocket/spacer and a non-derailleur chain tensioner. The single speed option was actually discontinued as a factory fit option in 2021
The two speed wheel uses a sprocket/spacer/sprocket with a derailleur chain tensioner
The driver / sprockets use a 9 spline Shimano style spline system - the same as the BWR 6 speed rear wheel (and the sprockets are compatible)
This wheel is based on the traditional AW / SRF-3 Sturmey Archer rear wheels - allows one sprocket to be fitted and uses the ISO 3 spline system on the driver.
The 13T sprocket used on this wheel is compatible with the 13T sprocket used on the 6 speed and 3 speed Sachs / SRAM rear wheel
This wheel was developed specially for Brompton by the resurrected Sturmey Archer when they became Sunrace Sturmey Archer. It allowed Brompton to offer a 6 speed Sturmey Archer rear wheel - using two sprockets
The main identifying feature is the driver - onto which the sprockets fit - it uses a 9 spline Shimano style system, with one of the splines being bigger than the others meaning that the sprocket can only be fitted correctly (as opposed to the 3 spline / ISO system used on previous Sturmey Archer wheels which allows fitting back to front)
Due to the difference in the driver from BSR / AW / Sachs / SRAM wheels - the sprockets used on the BWR are not compatible with these wheels
Generally they are labelled BWR or Brompton Wide Ratio on the hub
They have been available in silver (standard) or Black (initially for the Black Edition Brompton bikes). They are also used on 6 speed CHPT3 bikes
The BWR wheel / hub can easily be identified by the writing on the hub saying "BWR" or "Brompton Wide Ratio" as shown above
The BWR rear wheel takes 9 spline "Shimano Style" sprockets as shown above
These come as standard in a 13/16T combination. The 12T used on the 1 and 2 speed Brompton rear wheel is also compatible and will fit if you want a 12/16T combination
This wheel was an interim used by Brompton after Sturmey Archer went bust (before being resurrected!)
It allowed Brompton to offer a 6 speed option (using two sprockets) in addition to the 3 speed previously available with the Sturmey Archer 3 speed
Unfortunately Sachs were taken over by SRAM who eventually closed down the whole hub gear operation - so spare parts are no longer available for these hubs
The easy identification is the word SACHS 3 speed stamped on the side of the hub - the number of gears could be 3 or 6 based on the driver (if it can take one or two sprockets)
The following picture shows the top view - the identifying feature (comparing to the Sturmey Archer hubs) is the dimples
The below picture shows the driver side of the 6 speed hub - with the (now discontinued) sprockets removed
The sprocket stack on the SRAM / Sachs hub used a 3 splined / ISO sprocket - the current 13T sprocket on the Sturmey Archer hub will also work on the SACHS 3 or 6 speed (the 15 tooth SACHS sprocket is the one that is no longer available)
The Brompton / Sturmey Archer rear wheel is an older one - we will be back with more info soon!