---
product_id: 183856314
title: "EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm)"
brand: "ec90"
price: "$5.27"
currency: USD
in_stock: false
reviews_count: 6
url: https://www.desertcart.us/products/183856314-ec90-3k-matte-full-carbon-seatpost-seat-tube-mtb-road
store_origin: US
region: United States of America
---

# EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm)

**Brand:** ec90
**Price:** $5.27
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm) by ec90
- **How much does it cost?** $5.27 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/183856314-ec90-3k-matte-full-carbon-seatpost-seat-tube-mtb-road)

## Best For

- ec90 enthusiasts

## Why This Product

- Trusted ec90 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description



## Images

![EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm) - Image 1](https://m.media-amazon.com/images/I/613zRLwZF3L.jpg)
![EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm) - Image 2](https://m.media-amazon.com/images/I/61tR2XIv6hL.jpg)
![EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm) - Image 3](https://m.media-amazon.com/images/I/51yZIQ3SEGL.jpg)
![EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm) - Image 4](https://m.media-amazon.com/images/I/51MGzXP5TiL.jpg)
![EC90 3K Matte Full Carbon Seatpost Seat Tube MTB Road Bicycle Setback Seatpost (25.4 x 400mm) - Image 5](https://m.media-amazon.com/images/I/61r1db3ykQL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Cracked after 100 miles…
  

*by J***G on Reviewed in the United States on June 28, 2021*

After about a 100 miles it cracked while riding on flat street. About an inch and a half above collar. Would not buy again, you get what you pay for.Always kept indoors and used on smooth streets. I’m about 200lbs but never had trouble with carbon posts before.

### ⭐ 1.0 out of 5 stars







  
  
    Reinforced plastic will not last and may hurt the rider.
  

*by A***Z on Reviewed in the United States on July 31, 2021*

This weak plastic pole is everything you don't want in a seat post. I'm 185 pounds and had the pole inserted correctly. I've ridden less than 5 miles with this seatpost and it snapped causing me to fall on my a55 while riding in the street (ha ha).I've written very few reviews and I think this may be my first negative review.I wouldn't even trust this seat with a child. I mostly stand and pedal. If my 8 year old was into hopping off ramps or riding hard like kids do...it's only a matter of time. A 60 pound kid throwing his weight around is more intense than my periodic a55 taps.I thought when it broke...'well you get what you pay for..' but let's be real...this thin plastic with fiber glass reinforcement probably cost under $2 bucks to make. I've spent time crafting speaker boxes using fiber glass alone and you can definitely make something strong enough to stand on but this isn't that. This is thin layers of plastic...almost like plywood. You can see the thread of what looks like a single sheet of fiber glass but it's as thin as the butter you spread on bread. Literally.Imagine if you're the unlucky one who gets a jagged plastic tube shoved up your a55. Really....really imagine it.WORST. SEATPOST. EVER

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Light
  

*by J***Y on Reviewed in the United States on August 14, 2021*

Significantly lighter than the aluminum alloy post that came with the bike.  I haven't been able to tell the amount of flex that it offers

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**Shop now:** [https://www.desertcart.us/products/183856314-ec90-3k-matte-full-carbon-seatpost-seat-tube-mtb-road](https://www.desertcart.us/products/183856314-ec90-3k-matte-full-carbon-seatpost-seat-tube-mtb-road)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-25*