---
product_id: 152259984
title: "Bike Seat Post 27.2 30.9 31.6 x 350mm or 400mm Length FOMTOR Bicycle Adjustable Seatpost Mountain Bike Seat Post for MTB Road Bike BMX"
brand: "fomtor"
price: "¥7231"
currency: JPY
in_stock: true
reviews_count: 8
url: https://www.desertcart.jp/products/152259984-bike-seat-post-27-2-30-9-31-6-x
store_origin: JP
region: Japan
---

# Bike Seat Post 27.2 30.9 31.6 x 350mm or 400mm Length FOMTOR Bicycle Adjustable Seatpost Mountain Bike Seat Post for MTB Road Bike BMX

**Brand:** fomtor
**Price:** ¥7231
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Bike Seat Post 27.2 30.9 31.6 x 350mm or 400mm Length FOMTOR Bicycle Adjustable Seatpost Mountain Bike Seat Post for MTB Road Bike BMX by fomtor
- **How much does it cost?** ¥7231 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/152259984-bike-seat-post-27-2-30-9-31-6-x)

## Best For

- fomtor enthusiasts

## Why This Product

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

## Description

Bike Seatpost 31.6 400mm FOMTOR Bicycle Adjustable Long Seat Post Mountain Bike Seatpost for MTB Road Bike Folding Bike BMX

## Features

- Fit for frame seatpost hole Diameter:31.6mm.Post Length:400mm.thickness:2.5mm.Setback: 0 °/0mm. TIPS:Please confirm the seat post diameter of your bike is 31.6mm before you buy it.
- Made of High quality 6061 aluminium alloy.Light weight(0.68lb only),never rust and never bend.Strength: 4.9 levels ultra high strength, maxium of 580lbs.
- This 400mm long seatpost will help you to get better ride height on a relatively low bicycle.With adjustable head, convenient to install.Seat angle is adjustable.
- Suitable for most Mountain bikes, Road bikes, Folding bikes, Downhill bike, Track bike, MTB, BMX, DH, etc.
- How to Choose the Size:1.Check the diameter of the original seatpost,choose the same size as the original diameter.2.Measure the inside diameter of the frame tube.

## Images

![Bike Seat Post 27.2 30.9 31.6 x 350mm or 400mm Length FOMTOR Bicycle Adjustable Seatpost Mountain Bike Seat Post for MTB Road Bike BMX - Image 1](https://m.media-amazon.com/images/I/51t-1v9vgQL.jpg)

## Available Options

This product comes in different **Color** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Great seat post
  

*by R***K on Reviewed in the United States on February 27, 2020*

I purchased this for my new motorized bike...It worked better than the original...

### ⭐⭐⭐⭐⭐ 







  
  
    Fit perfectly.
  

*by A***A on Reviewed in the United States on August 1, 2020*

I needed a slightly longer seat post for my RAD City Step-thru bike.  This one fit perfectly & only took a few minutes to mount the seat & get everything adjusted.

### ⭐⭐⭐⭐ 







  
  
    Met all expectations.
  

*by C***P on Reviewed in the United States on September 9, 2019*

Did not come with any instructions. However, it is easy enough to install and figure out how to change the seat angle. The old seat post could not be raised any more  as it was at the minimum insertion length. This new seat post is much longer and being able to raise the seat made a huge difference in pedaling met efficiency especially on climbs. Construction seems sturdy, holding up very well so far with 225 lb load.

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**Shop now:** [https://www.desertcart.jp/products/152259984-bike-seat-post-27-2-30-9-31-6-x](https://www.desertcart.jp/products/152259984-bike-seat-post-27-2-30-9-31-6-x)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-07*