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Btwin 28.6 mm Seat Clamp

Sale price: $5.00 Regular price: $9.99

28.6 mm quick-release seat clamp.

Color: Select a color
Size: Select a size
Sale price: $5.00 Regular price: $9.99

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Final Sale: No returns or exchanges

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 3640200

Product Features

A photo of the Btwin 28.6 mm Seat Clamp in use

Btwin 28.6 mm Seat Clamp | tool-free fastening your seat post; fits on a 27.2 mm frame or seat post.

28.6 mm quick-release seat clamp.


For 27.2 mm frames and seat posts.

Easy to use

No-tool adjustment/removal of seat post.


6061 aluminum and SCM435 steel seat clamp.


1.3 oz.

Questions & Answers

Product Customer Reviews

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176 Reviews
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Btwin 28.6 mm Seat Clamp,light grey
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Great product easy use

Very good

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Good quality

I had to purchase a replacement as my seat and seat post was stolen. Easy to install.

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Doesnt fit

Despite saying on the Decathlon site and being told instore that this will fit the Rockrider 520 it is too small. Unfortunately my grandson has bent it out of shape trying to fit so I will now have to pay out for a larger one. Very unhappy with this situation and it has put me off using Decathlon for spare parts.

Dear Sir,
I'm very sorry to read that you were misinformed regarding the diameter and suitability of this seat clamp.
Please return it to us for a refund at your earliest convenience and I will work with the b'Twin brand to make sure that the information provided on the website is accurate.
Peter Lazarus, National Cycling Manager, DECATHLON


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I feel the design itself is faulty, because its extremly hard to impossible to secure the clamp tight enought for the seat to be in place when riding over a hump or a ditch. The material is soft and wears off. The staff at store understood the problem and replaced with a new one for the 1st time and for the 2nd time had the same issue and got a refund.

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Hello Nagaraj,

It is quite unfortunate that you had an issue with the seat post clamp. I would recommend rechecking if the size of the seat post clamp is exactly the same size that is required for your bike. The clamps come in 3 sizes 28.6, 31.8 & 34.9 mm. Please take advice from our technicians who could suggest the right clamp suitable.

Thanks & Regards,



Amazing Product I Am Using It On my My Bike

Amazing Product I Am Using It On my My Bike Amrit does the work properly, seat hight adjustment is so easy, it was better decision them upgrading the cycle for such facility.

Highly recommended

I must recommend this, if cycle is used by multiple members in family as they can easily adjust the seat as per their height.

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Using on my Mybike

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seat post clamp

convinient to use

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As displayed on the Website information it says that 28.6 mm clamp will fit a 27.2 mm seat post . So I did the same by visiting the nearest Decathlon store at Ghatkopar Mumbai. Bought one and kept it as a spare in my Saddle bag . Had an emergency where my original seat post clamp malfunctioned . However when I tried the seat post clamp taken from Decathlon it didn't fit . I unscrewed the Bolt all the way open and tried to install it still it didn't fit. When I placed the btwin seat post clamp over my Old seat post clamp for reference and measurement ,I was shocked to see that the clamp was way too small for by bicycle frame ( please note my Seat post is 27.2mm ) was totally disappointed with this product due to incorrect information provided on the website . when I check on Google it said for a 27.2 mm seat post It would need a 31.8mm clamp. Worst part is one of the Store guy also suggested me the same seat post clamp i.e is 28.6mm. please suggest me what should I do. I have the seat post clamp totally untouched stored in my Saddle bag however I do not have the original package of the clamp but I do have the original bill provided during the purchase.

Hello kenistan,

Thank you for taking the time to give us your review. We are really sorry for the experience you have had with the seat clamp. The Information for the product is common globally and if this is wrong it is a big problem. Please give me time to check for the accuracy in dimensions at the store. I would also like to know which bike you are using to know if the problem is bike specific. However as a solution to you you can return the product at the store purchased stating the above reason and the store will be able to give you the best solution (replacement/refund) based on better understanding the problem. Thank you.
this seat clamp is easy to use

Every cyclist should carry a spare seat clamp. Like me I never knew that a thing down your saddle known as seat clamp will broke while riding ..always wear a helmet and be focused.

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Couldn't be better

grip not strong enough secure seat post ....... level faulty

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Gut für das fixed gear elops

Funktioniert gut bei der Klemmung - auch mit über 100kg Fahrergewicht.


Verarbeitung ist dem Preis entsprechend billig aber es funktioniert Darauf kommt es an. Unbedingt den spezifischen Durchmesser beachten!

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Additional Product Information


Main fabric

  • 100% Aluminum



Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


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