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

Customer Reviews (11)
4.8 / 5| Write your review
£14.99 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 (11)
Questions & Answers (10) Q & A
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Product Reviews (11)
Overall Product Rating 4.8 / 5
The best!
By Kevin Banks
04 Nov 2023
5 / 5
I recommend this product
ProsFit, finish and length.
This adapter post is the best I've seen! The manufacture and machining is second to none for fit, finish and looks. Useable length into the bargain! Well done SJS!
Great product
By Colin S
28 Mar 2023
5 / 5
I recommend this product
ProsEasy to fit
Just needed to convert a smaller frame to ahead to raise the bars as I am getting old. I wanted a silver one too.
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 (10)
Info about the top cap
01 Jul 2023
Hi does this come with a top cap that overlaps the stem that is mounted on the steerer column, i cant see any cap in the images. Do you have a photo of the top cap style that is used. many thanks
Hi, the top cap is integrated into the stems design and is not removable. There will be a new photo showing this soon. Thanks
29 Jun 2023
I bought this fadapter rom SJS. It works with my 1" head tube but does not insert as far down the tube as i would have wanted. It seems that the tube has a slight internal taper and the lower half is a narrower diameter than the top half. My bars are higher than i would want. Ideally I would want to lower the bars an additional 3cm/ 4cm.

Does this adapter come in a version with a shorter lower section?

Is it feasible to cut the end of the lower section shorter?
Hello & thank you for your enquiry.
This item is specifically for 1 inch ( 25.4 mm ) fork, with 22.2 mm minimum internal diameter.
Total length 200 mm, with 130 mm to go inside the headtube, with minimum insert mark 80 mm from bottom of item.
Kind regards, PC 29/6/23.
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.