Brompton Sprocket / Disc Set 12T 1 Spd

£15.00 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Replacement 12T sprocket and disc set found on 1 spd Brompton bikes with Brompton's own freewheel hubs.

Click here to view our Hub gear Sprockets comparison table so you can be sure you are ordering the right size (Opens New Tab)
Please note Brompton have selling restrictions to some countries who have their own dealers. If you are unsure please contact our sales team.
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Questions & Answers (6)
2 sped to 1 speed
02 May 2022
I’m looking to convert my 2 speed to 1 speeds

Can I have a 58t front with a 12t rear? If so, what are the best custom sprocket rings and chain to use?
Please email [email protected] with your query so we can best assist.

See below...
25 Feb 2019
Is this the smallest rear sprocket you can fit onto a 1 or 2 speed 2018 Brompton (Brompton 12T rear sprocket)?
Also can a 2 speed Brompton have a 12T and 13T sprockets on the rear and a 56T chainring on the front?
Yes, 12T is the smallest. Yes you could have 12/13, yes 56t would be suitable.

Thanks - 25/02/19
Spare spacers
31 Dec 2018
Do you supply sprocket spacers seperately?
Hi there,

Yes we do. These can be found under part #34730.

Can I use this to convert my 2 speed Brompton to a Single speed?
11 Nov 2018
Do I need to purchase an other parts?
Yes, you may also need the following;
Chain - if yours is more than 1/2 worn.
Chain tensioner - if you want the stock set up, the 2/6 speed one will work fine, but the SS bikes come with the 1/3 speed tensioner.

Thanks - 12/11/18
Hi. Can I have this install on my 6speed bwr hub?
07 Oct 2018
Yes, but you will then only have 3 gears!

Possible to fit 12T on my 2017 3-speed Brompton?
10 Sep 2017
Hi. I have your excellent SJSC Brompton 3 Speed Super Light Wheel Set fitted on my 2017 3 speed Brompton with I believe, a 13T rear sprocket & a 54T front sprocket.

Will this 12T rear sprocket fit or do you have aftermarket lightweight sprocket available?

Unfortunately this sprocket uses a different fitting to the one on your hub and due to the fitting on your hub the smallest sprocket you can actually fit is a 13T, so you can't fit a 12T at all.