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USE Seat Post Shim 31.6 mm to 34.9 mm

Customer Reviews (6)

5 / 5| Write your review

£9.99

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Details

Custom machined alloy sleeve to space 25.4, 27.2, 30.9, 31.6 and 33.9mm seatposts to larger seat tube diameters.
ID (inside diameter) = 31.6mm OD (outside diameter) = 34.9mm

Product Reviews (6)

Questions & Answers (13) Q & A

Specification

Downloads

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Product Reviews (6)

Overall Product Rating 5 / 5

Gurt lush

By Matt

26 Sep 2023

5 / 5

I recommend this product

As described fast delivery well made all in all Gurt Lush

By Kevin

26 Aug 2022

5 / 5

I recommend this product

ConsCollar is a little bit tall.

ProsGood quality finish.

Good quality product at a great price.

Fixed a slipping dropper post

By Octave

09 Aug 2022

5 / 5

I recommend this product

ConsNone

ProsFixed an annoying problem

Original shim on my R M Superdelite had a slightly thinner wall section which meant the seatpost clamp was over tightened and the dropper post could slip. The USE shim corrected this. (R M please note)

By Janet O'Callaghan

15 Dec 2020

5 / 5

I recommend this product

ConsNone

ProsVery cheap and looks good.

What can I say, it works, very well made.

Major upgrade for £9.99 !

By M J West

12 Mar 2019

5 / 5

I recommend this product

I am upgrading a cheap eBay folding bike that I bought some time ago. The frame is stiff and light, but many other components are poor. Quality tyres made a significant difference but replacing the plastic (!) shim, which came with the bike, with this precision machined one has transformed it. The saddle stays at the selected height - a fundamental requirement for comfortable cycling.

Use Seat Post Shim

By Kit Spackman

04 May 2012

5 / 5

Prosit works,light,looks good,good price

Great piece of kit! Trying to fit an old style Moulton APB alloy seat pillar into a newer style seat tube is an exercise in frustration as the diameter change so large. Until I found the USE item I was stumped, but that worked a treat. Not only is it a good price, it's well made, fits exactly and even looks good too.

Questions & Answers (13)

Do you have 34mm to 38.8mm?

By Victor Caligari

16 Jul 2024

SJS Customer Service:

Sadly we will have nothing to meet this dimensions, you will need to look at having something machined. SK 16/07/24

Is this the thermo plastic shim ?

By felms

30 May 2021

In the Q & A section it says that you think the shim is alu. Is this not the thermo plastic version ?

SJS Customer Service:

Thank you for your enquiry, yes it is alloy

WD 01/06/21

Is this aluminium or plastic please?

By Don

22 Apr 2021

SJS Customer Service:

Thank you for your enquiry, it is aluminium

WD 23/04/21

Can I use this shim with a carbon seatpost?

By Anton

04 Sep 2019

SJS Customer Service:

Yes, no problem to use with carbon.

Thanks - 09/09/19

Specialized Kenevo

By Alex Farrow

11 Jan 2019

Will this be ok for fitting a 31.9 diameter seat post into a Specialized Kenevo that has a seat tube diameter of 34.9?

SJS Customer Service:

Yes, this will work.

Thanks - 14/01/19

34mm seat post to 31.6mm

By Barry Davison

03 Dec 2018

Hello I am having trouble finding a shim to fit 34mm seat post for converting to 31.6mm suspension seatpost. I have severe spinal issues and can only tolerate electric bike with decent suspension seatpost. However the new bike I have just converted to electric has this odd sized post. I'm an engineer but wondered if gap in the 34.9 seatpost shim would accomadate the 0.9 mm difference fit into seatpost opening and fir 31.6mm seatpost???
Thanks in advance for any help its appreciated.
Regards,
B.Davison

SJS Customer Service:

Unfortunately we could not recommend that would be suitable.

Thanks - 04/12/18

What material is this made from, is it plastic or aluminium etc?

By Kevin

29 Nov 2018

SJS Customer Service:

Hi there,

We believe that this is made from aluminium.

Thanks.
29/11/18

Can I use this with Pinarello FP2 Carbon 2012?

By Morgan

12 Feb 2018

SJS Customer Service:

Hi there,

As long as the sizes match up then this should work.

Thanks

What size shim will I Need to use a 31.6 dropper post when the seat post on my gt is saying 34.9

By Shaun

10 Dec 2017

My seat post is 34.9 but my dropper post is 31.6. What size shim will I Need please.

SJS Customer Service:

Hi,

This shim will work to convert your 31.6mm seatpost to fit the 34.9mm frame perfectly.

Thanks

can i use the noted seat post shim with a scott scale 930

By stephen

07 Dec 2017

SJS Customer Service:

Hi,

If the internal and external diameter fit your specification then this will fit.

Thanks

What is the lenght? Thanks

By Gianni

16 Nov 2017

SJS Customer Service:

Hi,

This shim is 100mm in total length with 92mm fitting within the frame.

Thanks.

Hi, This Will Fit On Birdy Folding Bike Seatpost (34.9 Dia) Will Convert To 33.9Mm Seatpost Dia?

By Bong

01 Nov 2016

Birdy folding bike seatpost dia is 34.9mm. I want to use litepro seatpost size is 33.9mm i need seatpost shim/ adapter to fit the 33.9mm seatpost on my birdy folding bike

SJS Customer Service:

Hi,

We don't have any shims that are the correct size straight away for your needs I'm afraid. You could modify this shim by increasing the inner diameter to 33.9mm or you could use a "drinks can" shim as the alloy in these is usually around 0.5mm thick which would give a 1mm increase in diameter around the post.

Thanks.

Can You Please Confirm This Is The Correct Size Shim For A Moulton Tsr ?

By Stelios

19 Sep 2016

Can you please confirm this is the correct size shim for a Moulton TSR ?

SJS Customer Service:

Hi,

We have never sold Moulton bikes so we have no way of knowing what size seat tube your bike has I'm afraid. If you bike has a 34.9mm seat tube then this would be the correct shim to take it down to 31.6mm.

Thanks.