Joseph Kuosac Headset - 1 1/8" - Black

Customer Reviews (3)
5 / 5| Write your review
£24.99 Please note this product has selling restrictions to your country. was
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SJS Cycles part number : 
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A great upgrade from the stock Brompton headset.
Smooth and durable sealed bearings.
To fit 1 1/8" threaded frames / forks.

When fitting to a Brompton, we advise removing the spacer.

PLEASE NOTE: This headset is suitable for use with Brompton's Titanium fork, however previous versions were not.
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Product Reviews (3)
Questions & Answers (10) Q & A
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Product Reviews (3)
Overall Product Rating 5 / 5
Great product and VFM
By Anonymous
15 Sep 2022
5 / 5
I recommend this product
Simply brilliant for the money, very smooth when in use and a great upgrade.
Nice upgrade
By Dave Phillimore
06 Mar 2021
5 / 5
I recommend this product
Prossealed bearing ,over the stock brompton one
I Bought this headset to replace the stock brompton one, As its uses sealed bearings ,Its a very nice headset for the money . it is definitely a worthwhile upgrade for your brompton
Top Finish
By Jay W
02 Nov 2018
5 / 5
I recommend this product
Bought this and other JK items as finishing kit touches. It will be great when my new colour scheme is finished. Really pleased
Questions & Answers (10)
Can be used in a Brompton electric
28 Jun 2022
I need to change this, and I thought that this would be a nice upgrade. Would it fit in an electric Brompton?
Thank you for your enquiry. Yes, this headset is compatible with the Brompton Electric bike.
Kind Regards. JP 29/06/22
What's the reason JK headset can't be install on Brompton Titanium fork?
05 Aug 2021
The inside of the cup binds on the steerer tube.

Thanks! 05/08/21 RH
18 Jul 2020
Hi, due you have any idea when this will be back in stock?
Hi, we are expecting stock at the end of July. Thanks
Is this suitable for SL2-X 2017 pls?
28 Feb 2020
No, these are not suitable for use with Brompton's Titanium fork.

Use - SJS Cycles part number : 52687

Thanks - 03/03/20
What's the stack height of this?
10 Oct 2019

What's the overall stack height of this compared to a Brompton one?

I ask as I have a JK one installed on my 2015 M6L (steel forks) and have the issue that there are only 3 or 4 threads of the threaded forks' column/stem engaged with the top locknut, which suggests the stack height is greater.

Hi there,

The stack height is approximately 48mm.

What's included?
13 Jun 2019

Does this headset kit include everything needed to replace the Brompton headset i.e. absolutely everything top and bottom of the head tube, including seals?

Presumably you need to prise off the Brompton bearing races/cups in order to replace with the JK cartridge bearing? If so, is this a difficult job?

And what size spanners are needed for the nut and locknut, please?

Yes, the complete headset, as pictured, is included.

The lock nuts are for 36mm spanners and yes you would need to remove the stock cups and crown race. - very easy if you have the correct tools / knowledge/experience.

Thanks - 14/06/19
Coming loose every few days
14 May 2019

I've bought this and had it fitted a few months back by Evans on a Golden Brompton Service, but I need to tighten it every few days and always find myself taking the headset wrenches with me... is this possibly because of a defective headset, or was it a wrong fitting from the very beginning? Would you be able to advise? I think it's quite dangerous to have it come loose all the time.

Hi there,

This sounds like it has not been fitted properly, the two nuts need to be locked off against each other properly.

Thanks - 14/05/19
Why won’t it fit the titanium forks and is it lighter than the standard unit?
30 Apr 2019
The lower section fouls / binds on the steerer tube. Yes it is lighter, we recommend using SJS Cycles part number : 35038

Thanks - 30/04/19
Can it be used on any Brompton?
02 Dec 2018
Apart from Ti fork, I've read that. Thanks
Yes, we have fitted to many Bromptons including staff bikes!

Thanks - 03/12/18
Sealed and it looseball?
08 Nov 2017

These headsets use sealed cartridge bearings.