---
product_id: 75348385
title: "Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm)"
brand: "upanbike"
price: "443 kr"
currency: DKK
in_stock: true
url: https://www.desertcart.dk/products/75348385-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy-seat
store_origin: DK
region: Denmark
---

# 17.7" length Lightweight 0.37kg Adjustable clamp Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm)

**Brand:** upanbike
**Price:** 443 kr
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Ride High, Ride Right!

## Quick Answers

- **What is this?** Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm) by upanbike
- **How much does it cost?** 443 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/75348385-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy-seat)

## Best For

- upanbike enthusiasts

## Why This Product

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

## Key Features

- • **Precision Fit:** Compatible with multiple diameters (25.4mm to 31.6mm) for universal appeal.
- • **Custom Comfort:** Micro-adjust clamp allows for perfect saddle tilt, ensuring optimal riding posture.
- • **Elevate Your Ride:** Transform your biking experience with an extra-long seat post designed for comfort.
- • **Built for the Bold:** Ideal for mountain and road bikes, this seat post is a must-have for serious cyclists.
- • **Light as a Feather:** Weighing only 0.37kg, this aluminum alloy seat post won't weigh you down.

## Overview

The UPANBIKE Extra Long 17.7inch Aluminum Alloy Seat Post is designed for tall riders seeking comfort and adjustability. With a micro-adjust clamp for precise saddle tilt and compatibility with various bike types, this lightweight seat post is the perfect upgrade for any cycling enthusiast.

## Description

Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm)

## Features

- To fit frame seatpost hole: 25.4mm, Extra long: 17.7" (45cm); Help to raise height of saddle, so that tall rider don't have to bent much forward
- Important note: real measure of the seatpost diameter is a little smaller than the number marks on it. e.g.:25.4mm one may measures about 25.0~25.2mm only
- Clamp is adjustable for the saddle tilt angle
- Replacement seatpost for most bike, mountain bike, road bike, universal bikes
- 【IMPORTANT NOTE】Before ordering, please do make sure to measure and confirm the diameter that you actually need. Thank you.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Bike type | Mountain Bike |
| Color | Black |
| Size | 25.4*450mm |
| Item display length | 18.5 inches |
| Weight | 0.37 Kilograms |
| Material type | Aluminium |
| Batteries included? | No |
| Brand | UPANBIKE |
| Department | Men's |
| Manufacturer | UPANTECH |
| Item model number | 50-128 |
| Package Dimensions | 49.1 x 7.2 x 4 cm; 420 g |
| ASIN | B01EHHKX9E |

## Images

![Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm) - Image 1](https://m.media-amazon.com/images/I/51ImJ4lnkbL.jpg)
![Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm) - Image 2](https://m.media-amazon.com/images/I/71uwG3afd0S.jpg)
![Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm) - Image 3](https://m.media-amazon.com/images/I/61fffLiQceS.jpg)
![Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm) - Image 4](https://m.media-amazon.com/images/I/61l0ryzHfqS.jpg)
![Extra Long 17.7inch (450mm) Bike Bicycle Alluminium Alloy Seat Post with Micro Adjust Clamp (φ 25.4 27.2 28.6 30.4 30.9 31.6mm) - Image 5](https://m.media-amazon.com/images/I/51-ZZdv2rBS.jpg)

## Available Options

This product comes in different **Size Name** options.

## Questions & Answers

**Q: minimum insertion

so what exactly is the minimum length that needs to be inserted, or maximum length not inserted ?**
A: Minimum 15cm inserted? The remainder for saddle  hight adjustment is 22.5cm.

**Q: Will this work well for dyu d3f electric bicycle?**
A: Not a clue but cannot see any reason why not if the downtube diameter is the same

**Q: K so is this more or less the standard size for bmx mtb racers coz ive found that they are all the same size?**
A: I know nothing about BMXs. I bought this long post because I have long legs and the post that came with the new electric bike I bought would not allow me to raise the saddle high enough to be comfortable for me.   The new post was, and is, fine.

**Q: My post says 30.9 so would a 30.8 be best?**
A: If you are describing the diameter of the post 30.8 should be okay

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**Shop now:** [https://www.desertcart.dk/products/75348385-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy-seat](https://www.desertcart.dk/products/75348385-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy-seat)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-26*