USE Seat Post Shim - 27.2 mm ID

Customer Reviews (9)
4.9 / 5| Write your review
£9.99 Please note this product has selling restrictions to your country. was
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SJS Cycles part number : 
Manufacturer part number : 
The USE shim system allows you to fit a seat post into virtually any frame size. Our shims are made to 100mm length and are longer than other shims on the market giving your seat post much better support inside the frame. All shims are designed with a "top lip" to stop the shim sliding into the frame.

Shims are available in Aluminum and Thermo Plastic, despite the latter being a lighter solution its material characteristics limit the thickness of the ID - OD measurements. Aluminum is used to achieve the thinnest shims as it is a more robust material.

Rolled Aluminum shim - the very thinnest shims are rolled from sheet metal. 25.4mm shims need to be so thin as they are etched down in acid to the correct tolerance and are too thin to anodise (show as silver).

Machined Aluminum shim - machined to very high tolerances from 6082 T6 Aluminum and then black anodised to protect from corrosion.

Machined Plastic shim - larger size shims are machined to very high tolerances from "filled" engineering thermoplastic UPVC. This keeps the weight down, as the shims get thicker.

Shim design characteristics may affect weight.
Weights are accurate to the nearest gram.
Shims allow a rider to adjust the ID of a frame for a range of different sized posts.

OD 27.8mm - Aluminium
OD 28.0mm - Aluminium
OD 28.2mm - Aluminium
OD 28.4mm - Aluminium
OD 28.6mm - Aluminium
OD 28.8mm - Aluminium
OD 29.0mm - Aluminium
OD 29.2mm - Thermo-Plastic
OD 29.4mm - Thermo-Plastic
OD 29.6mm - Thermo-Plastic
OD 29.8mm - Thermo-Plastic
OD 30.0mm - Thermo-Plastic
OD 30.2mm - Thermo-Plastic
OD 30.4mm - Thermo-Plastic
OD 30.6mm - Thermo-Plastic
OD 30.8mm - Thermo-Plastic
OD 30.9mm - Thermo-Plastic
OD 31.0mm - Thermo-Plastic
OD 31.2mm - Thermo-Plastic
OD 31.4mm - Thermo-Plastic
OD 31.6mm - Aluminium - 56 grams.
OD 31.8mm - Thermo-Plastic
OD 32.0mm - Thermo-Plastic
OD 32.2mm - Thermo-Plastic
OD 32.4mm - Thermo-Plastic
OD 32.6mm - Thermo-Plastic
OD 32.8mm - Thermo-Plastic
Product Reviews (9)
Questions & Answers (15) Q & A
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Product Reviews (9)
Overall Product Rating 4.9 / 5
By Christopher Flint
06 Jul 2022
4 / 5
I recommend this product
ConsA little expensive for what it is
ProsWell made
Well engineered Size down shim too fit Thudbuster ST into Thorn tandem frame. Does the job perfectly.
Fantastic precision made great service from SJS cycles to Australia
By Kim Parslow
11 Mar 2022
5 / 5
I recommend this product
ProsPerfect fit and looks awesome
Thanks for great part and great service
Sorted a slipping seat post
By Anonymous
02 Oct 2021
5 / 5
I recommend this product
ProsStopped slipping seat post
My new seat post fitted with a Humpert shim was slipping even with Finishline Fiber Grip. I contacted SJS Cycles and they recommended a USE plastic shim. I ordered the shim and even though I think it is aluminium (31.6) not plastic it has stopped the slipping.
It's a Shim!
By Aleman
25 Aug 2020
5 / 5
I recommend this product
ConsMeasure carefully with calipers to get the right one
ProsWide range of sizes with small increments
It may be
12 May 2020
5 / 5
I recommend this product
Well made does the job well
Perfect for the job
By B Turpin
29 Jul 2018
5 / 5
I recommend this product
Did the job perfectly and arrived bang on time
Brilliant *****
By David Gould
12 May 2018
5 / 5
I recommend this product
Did the job perfectly.
Making the job
By Pavel Kriz
01 Dec 2017
5 / 5
I recommend this product
ProsLightweight Thermo-Plastic
I'm using version 27,2 - 29.4mm - Thermo-Plastic, real weight is 12g. Extended length for better seatpost support. Great, precise product.
By Darren
03 Nov 2017
5 / 5
I recommend this product
ProsWell made aluminium, good strong top lip to stop it sliding down your seat tube.
A good well made product that allows you to fit almost any seat post to your frame, good price and super quick delivery well recommend.
Questions & Answers (15)
What material is the 27.2 - 31.8 shim made of?
03 Feb 2023
Thank you for your enquiry, the 27.2 to 31.8mm shim is made from Thermo-Plastic. I hope this helps.
Kind Regards. JP 06/02/23
What material is the 27.2 - 30.9 shim made of?
17 Jul 2022
I am looking for a plastic 27.2 to 30.9 shim thanks
Hi, this shim is not available in 30.9. All of the 30.9 shims we have are alloy.
Does USE shim (SJS NO. 22922d278) FIT 27.2mm seatpost into a 28.2mm seat tube?
06 Aug 2020
Hi no. You need 28.2 - 22922D282 . Thanks
I have a colnago c50 need 28 seatpost do you have a shim to take 27.2-28
28 May 2020
Hi, 22922D280 allows you to fit a 27.2 post into a 28 seat tube. Thanks
I have a 29mm seatpost and a 31.6 seat tube internal would you have a shim for that.
10 May 2020
The Humpert Seat Post Shim - 27.2mm ID in 29.8 choice (SJS Cycles part number : 32254D298) will spring out to make up the 2.6mm you need. RT
18 Apr 2020
I have a seat post that is 22.2mm with a fitted seat and would like to use on a 27.2mm seat post tube. What size shim will I need ?
Hi, we do not have a shim of those dimensions. A specialist engineering company might be able to make you one. You are looking for 22.2 internal with 27.2 external diameter. Thanks 20/04/2020
27.2 shim
07 Jan 2020
Hi, I have a 27.2 seatpost but the coating has come off it meaning it slippes. I have used a shim made from a coke cak that works ok. But when traveling this is not ideal as its too flimsy. What do you recommend, a 28.6 or 27.2mm shim that is 0.5mm thick? thanks
We would be more likely to simply replace the seatpost if you think thats the issue!

Thanks - 07/01/20
Could i use such a shim on external seat post of dropper.
25 Oct 2018
Could i use such a shim on external seat post of dropper- too stop it sliding down into tube when my 90kg impacts saddle causing post slip.? it seems a good idea.? i would need ID=27.2 and OD= maximum possible .
A shim reduces the surface area and therefore would increase the chance of slipping.

Thanks - 26/10/18
I have a new seatpost which is 27.2 but really it should be 28.4 so what size shim do I need ?
22 Jul 2018
You simply need the 28.4mm option as these are all for 27.2mm posts.

Shim for a 1mm gap?
21 Jun 2018
Can I use an aluminium shim to get my 25.4mm seat post to fit snugly in a frame meant for a 26.4mm seat post? It's a 1976 Dawes Tourer and I don't really want a modern seat post. Also if it will work, which length should I get and can you send it quickly? Thanks. Tom
Yes, we would suggest using - SJS Cycles part number : 20717S264

I need one to fit 30.9mm. do you have this size/ or can i use 30.8??
15 May 2018
We would recommend using SJS Cycles part number : 20718S309

can i use this with venzo frame
02 May 2018
according to venzo frame specs, the seat post diameter is 31.6 and the clamp diameter is 34.9 , i want use either the promax or humpbert seat posts of 27.2
Hi there,

If if the post you choose is 27.2mm and you select the 31.6mm option, and the frame is 31.6mm, this will work.

Hi the use seatpost adapter od 31mm Id 27.2mm can I use the existing seat Post clampthanks Mike
14 Aug 2017
It is a pinarello f4-13 frame

You should be fine to use your existing seatpost clamp.

Why Is The 31.6 Option In Aluminium , When There Is Thinner And Fatter Sizes In Plastic
27 Dec 2016

Unfortunately this is just how USE supply them. I'm sure at some point there was a valid reason for it, but unfortunately we don't know what the reason is and they have been supplied like this for a great number of years.

Use Seat Post Shim - 27.2 Mm Id
21 May 2014
i want to buy a USE Seat Post Shim 27.2 mm ID to 28 mm OD,i live in Taiwan,can you sipp it for me?how much i need pay totally?by bank transfer or credit card ?
best regards

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