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Btwin 27.2 mm to 29.8 mm Seat Post, 27.2 mm diameter

Sale price: $29.99 Regular price:

Black seat post for 27.2 mm frames with 29.8 mm to 33 mm adapters.

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Size: Select a size
Sale price: $29.99 Regular price:

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8350483

Product Features

A photo of the Btwin 27.2 mm to 29.8 mm Seat Post, 27.2 mm diameter in use

Btwin 27.2 mm to 29.8 mm Seat Post, 27.2 mm diameter | 27.2mm frames with 29.8mm to 33mm adapters. Length: 330 mm.

Black seat post for 27.2 mm frames with 29.8 mm to 33 mm adapters.


For 27.2 mm frames with 29.8 to 33 mm adapters and saddles with rails


6061 aluminum body and saddle rail clamp.

Easy to use

Adjustable and tilting seat clamp.

Product Customer Reviews

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563 Reviews
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Btwin 27.2 mm to 29.8 mm Seat Post, 27.2 mm diameter,base color
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excellent Seat Post

light and easy to carry and swap seats

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Good quality

Good product

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this broke my bike frame

I bought this to replace the seat post that I had as it was very heavy when riding. I used the shim that was supplied with the post so it was a tight fit and the post wouldn't slip down when riding....skip to a few months later my frame snapped under the seat post. Cracked and snapped the frame meaning I have to now buy a whole new bike as the frame is not safe even if I were to get it welded back together, it won't be safe to ride. So yeah, THANKS A LOT!!!! MOST EXPENSIVE SEAT POST I HAVE EVER BOUGHT, THE COST OF A NEW BIKE AND ALMOST MY LIFE..... I CERTAINLY WON'T BE BUYING FROM DECATHLON EVER AGAIN.

Value Seatpin

I've had two of these seatposts now on different bikes. Excellent value for money, and would have given 4 to 5 stars, but both posts failed after the two year guarantee ended. Definitely worth buying for a budget bike, but would recommend changing every two years.

Attractive and well priced...

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Very good

Very good

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Superb fitting

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Great quality product

Perfect Fitting

Packaging was Good It is a perfect seatpost for my cycle Trek Marlin 6

nyc quality


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Good quality had to return owing to size

Quality is good, but description doesn’t state usable sizes (how much of 330 mm is to be kept inside frame at min), had to return as it wasn’t long enough for me

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Seat post

It's easily fitted with my city bike with out any assistance,now i getting my right riding height in bike

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Lightweight, sturdy.

My old seat post was totally iron, this one in comparison felt lot lighter. The sddle mount can be tilted and is held by two screws. This is my first time using such seatpost, therefore, how long the screws will suffice, remains to be seen.

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Well made.

Well made.

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Dear Darren, thank you for your time in leaving us with a 5-Star rating on our product. We are glad that we managed to delight you with the standards of our product. We really appreciate your loyalty with Decathlon. Please let us know if there is anything else we can improve on in the future. Thank you once again for your time and we hope to serve you again soon!


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Additional Product Information



  • 100% Aluminium 6061



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


Size Guide Visual