Brompton 6 To 3 Speed Conversion

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We’re going to show you how to do a Brompton 6 to 3 speed conversion!

Watch the video to learn how, or read the step-by-step instructions below:

Bromptons come in different gear options:

  • 1 speed (discontinued for 2021).
  • 2 speed – 2 sprockets and a derailleur.
  • 3 speed – Sturmey Archer Hub Gear –BSR.
  • 6 speed – a combination of the Sturmey Archer BWR hub and a 2 speed derailleur.

Why do a Brompton 6 to 3 speed conversion?

It partially comes from a question we had about Brompton Electric. Can they be changed to 3 speed?

The answer is yes! And here’s the result of doing so:

  • Cleaner look without the derailleur mechanism.
  • Simpler with less gear levers / combinations.
  • Wide range 3 speed compared to the standard 3 speed.

Here are the steps necessary to do the 6 to 3 speed conversion:

Step 1

  • Remove old chain tensioner.

TIP: Remove tension.

TOOLS REQUIRED: 15 mm spanner.

Step 2

  • Remove wheel – including fixings and chain tensioner.

Here’s a video we made earlier telling you how to do it:

TIP: Remove air from tire so it will fit between the brake blocks.

Here’s some information about the inside of the Sturmey Archer hub:

Step 3

You must remove old sprocket stack.
You must remove old sprocket stack.

  • Remove old sprocket stack (Tools required: Small flat head screwdriver).

TIP: Whenever you change your sprockets, change your chain.

Step 4

  • Clean wheel inside to get warm.

Step 5

Now install new sprocket stack.
Now install new sprocket stack.

  • Install new sprocket stack (QRSPRSTACK-BWR3).

Step 6

  • Remove chain pusher, etc.

Step 7

  • Shorten chain (use chain link pliers to remove the master link, and chain tool to cut two links).
  • Rejoin the chain.

Link to chain choice and installation

Step 8

  • Install wheel.

Step 9

  • Install new chain tensioner and set up gears.

Hub gear setup

Step 10

  • Remove gear shifter.

Step 11

  • Get out and ride (once the snow stops).

Thank you for joining us. If you have any questions, comments, or suggestions, please let us know in the comments section below.

To find out more about Brilliant Bikes, visit:

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Brilliant Bikes
We are creating a better place ... where we help you get to work or to the shops or just get out for a ride in a fun, healthy and environmentally responsible way - and with the right equipment so that you are pretty sure it's not going to be a one way trip. We started vittually in 2009, selling bicycle tools, spare parts and accessories using the Internet. In 2013 we opened our first shop in Chobham, Surrey, England so we now provide full mechanical service on all types of bikes (service, repair, upgrades and custom builds) as well as sales of new bikes from Brompton, Frog (children's bikes), Orbea (mountain, road and hybrid / comfort) and Pashley (British built classic bicycles). To us, cycling doesn't mean you have to race at elite level (though is there any reason not to?) - why not just take your bike next time you go to the Post Office or local shops? But maybe you need to do something, to make your bike better for that ride - repairing something or adding lights to keep you safer - for example? We hope you will find what you need here to help you keep cycling or re-kindle the love affair with your bike.

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