Genetic Quill Stem Adaptor - 1 Inch Quill to 1 1/8 Inch Threadless Adaptor

Customer Reviews (9)
4.8 / 5| Write your review
£12.99 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Total length = 200mm, 50mm at the top is for fitting 28.6mm ahead stem, of the remaining length 130mm can go inside your head-tube, the min insert mark is 80mm from the bottom.

Weight - 266g

Note: This is for a 1" (25.4mm) fork with a 22.2mm internal diameter.
Product Reviews (9)
Questions & Answers (8) Q & A
Download File  
Product Reviews (9)
Overall Product Rating 4.8 / 5
Great bit of kit
By Phil Masters
14 Oct 2020
5 / 5
I recommend this product
Ideal for converting my old steel framed road bike, well made and nice and sturdy.
By Steve Davey
10 Sep 2020
5 / 5
I recommend this product
ProsAs above
Really recommended. Seems strong and is smart. Well finished product. A nice length as well, reassuring to know it's secure inside the fork.
By Roger U
12 Jun 2020
4 / 5
I recommend this product
ProsEasy to fit
I bought this and a shorter, elevated stem as the original quill fitting was giving me neck-ache. Looks well made, easier to fit overall than the previous quill, and works well. It leaves 1/2” of post above the stem clamp, which looks a bit odd. Does the job well.
Very useful
27 Apr 2019
5 / 5
I recommend this product
ProsPrice, well made, looks good.
Bought to raise the height of the handlebars to suit my ageing body! Allows the use of an aheadset stem. Have experienced a few creaks and squeaks, but I'm also using it with a shim on a 1x1/8th fork so that may not help. Not the lightest piece of kit, but seems well made. A much better option than buying a complete new fork to achieve a relativeley minor change.
10 Nov 2018
5 / 5
I recommend this product
Proslooks, price
Nice looking and does the job perfectly, and a good price
Top Quality Piece Of Kit.
By Anonymous
24 Mar 2017
5 / 5
I recommend this product
ProsTop quality
Far superior to others I have used. Nice flanged seat for stem mount. No need for spacers, & a polished finish.
Well thought out & a lovely bit of kit.
Beautifully Made Example Of A Quill Adaptor
By Stephen N Hilton
12 Jun 2012
5 / 5
ProsWell finished, strong and long
Used to adapt oversize 31.8 stem and bars to threaded 1inch headset. Looks and works well though had to refit and tighten after a few months to cure squeaks.
One Of A Kind Quill
By Anonymous
12 Feb 2011
5 / 5
I recommend this product
ProsClassical look, no spacers needed, space for putting a bell on
This is the perfect quill because I can use an ahead stem AND I can take the bell on it... No stupid spacers... just a clean elegant shape. There is nohing similar on the market!! Highly recommended
Genetic Quill Stem Adapter- 1
By Anonymous
20 Oct 2010
4 / 5
I recommend this product
Exactly what I was looking for with a reasonable quill length to raise the bars to suit my height which is 6' 4".
Questions & Answers (8)
Can I use a different top cap with this adapter?
20 Oct 2021
I have a cinelli pizza top cap that I’d like to use.
Thank you for your enquiry, no sorry as the top cap is integral

WD 21/10/21
1" diameter quill stem on bike?
06 Aug 2020
I have measured the quill stem on the bike and its 1". Will this fit?
Hi, yes this will fit in place of a 1 inch quill stem. Thanks
Any clue where I can get a bevelled black spacer to sit against the flange?
21 Sep 2019
I want to use this with spacers. Any clue where I can get a bevelled black spacer to sit against the flange?
We could not advise sorry! Most spacers should sit flush / close to flush to the top anyway.

Thanks - 24/09/19
22mm model?
09 Sep 2019
I'm looking for a version of the same, except for the old French 22.0 standard. A cyclery in Washington State used to sell them but no longer. Any idea?
Hi, sorry we don't have 22.0. Thanks 13/09/2019
Dimension from at top of STEM
19 May 2019
Could you tell me the length of the adapter that forms the 1,1/8 (25.6mm) part of the stem
The top length is 50mm.

Thanks - 20/05/19
Does this come with a cap, or does that have to be purchased separately?
10 Dec 2018
A top cap is included.

Thanks - 11/12/18
or as means of using both a 1 inch quill stem or 1-1~8 stem?
10 Feb 2018
Basically doing a build of a track bike and would wish to know traditionally the bike has always had a quill threaded headset,...could i then use a fork that has a 1inch steel threaded steerer with this adaptor together with a stem that is 1-1~8 clamp?
Hi there,

This stem is designed to fit a 1inch threaded fork with a 1.1/8th stem.

Can You Please Confirm This One Is An Alloy Part?
08 Jul 2015
It would be crucial, that I get an aluminium part. Based on the picture this tube has quite thick walls, so I suppose it is made of an aluminium alloy. (As opposed to a simple steel tube.)

Can you please confirm?

This quill stem adapter is indeed made from and alloy and not made from steel.