---
product_id: 44402700
title: "Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm"
brand: "upanbike"
price: "R853"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Upanbike"
url: https://www.desertcart.co.za/products/44402700-bike-seat-post-aluminum-alloy-extra-long-17-7inch-450mm
store_origin: ZA
region: South Africa
---

# Extra long 17.7 inch (450mm) length Fits multiple diameters 25.4-31.6mm Adjustable saddle tilt clamp Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm

**Brand:** upanbike
**Price:** R853
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Elevate your ride, own the road with UPANBIKE’s extra-long seatpost!

## Quick Answers

- **What is this?** Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm by upanbike
- **How much does it cost?** R853 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/44402700-bike-seat-post-aluminum-alloy-extra-long-17-7inch-450mm)

## 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

- • **Custom Comfort Angle:** Adjustable clamp lets you fine-tune your saddle tilt for personalized ergonomic support on every ride.
- • **Ride Tall, Ride Proud:** Extra-long 17.7-inch seatpost elevates your saddle for a comfortable, upright ride—no more bending over awkwardly.
- • **Sleek, Universal Style:** Matte black finish complements any bike color, making your ride look as sharp as it feels.
- • **Lightweight Aluminum Alloy:** Durable yet lightweight construction means you get strength without the bulk—upgrade your bike’s performance effortlessly.
- • **Precision Fit for Every Frame:** Available in six diameters (25.4 to 31.6mm) ensuring a seamless fit for mountain, road, and universal bikes.

## Overview

The UPANBIKE Bike Seat Post is a premium 17.7-inch (450mm) aluminum alloy replacement seatpost designed for tall riders seeking extra saddle height. Compatible with multiple frame diameters from 25.4mm to 31.6mm, it features an adjustable clamp for precise saddle tilt customization. Lightweight and durable, this sleek black seatpost fits mountain, road, and universal bikes, delivering enhanced comfort and style.

## Description

desertcart.com : UPANBIKE Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm(25.4mm) : Sports & Outdoors

Review: Excellent Length at Great Price. Won't Find a Better Value or Length - I extensively looked for a Replacement Extra Long Seatpost Seat Post. And deceided on the UPANBIKE Bike Bicycle MTB Replacement Extra Long Seatpost Seat Post 17.7inch The 25.4 I ordered was an absolutely perfect fit and at 17.7 inches long, it gave an inch or two more than any others I reviewed. I didn't go wrong. Actually, the UPANBIKE is a much better post than than the one my bike's manufacturer was selling on desertcart. In addition, you can adjust the seat sitting position a few angle. The photos on desertcart show how easy it is to install. No issues whatsoever. Very satisfied with this purchase and a black post goes with any color bike. I am very satisfied for the quality, length, and price value.
Review: Good good quality - perfect seat post replacement, I needed something a little longer, and It looked like it was made by the exact same manufacture that came with my Ebike, it just has a different name on it.

## Features

- To fit frame seatpost hole: 25.4mm
- 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
- Extra long: 17.7" (45cm); Help to raise height of saddle, so that tall rider don't have to bent much forward
- Replacement seatpost for most bike, mountain bike, road bike, universal bikes
- Clamp is adjustable for the saddle tilt angle

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0728CHP4X |
| Best Sellers Rank | #145,036 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #91 in Bike Seat Posts |
| Brand Name | UPANBIKE |
| Customer Reviews | 4.6 4.6 out of 5 stars (839) |
| Date First Available | May 17, 2017 |
| Item Dimensions LxWxH | 1 x 1 x 17.72 inches |
| Item Package Dimensions L x W x H | 19.17 x 3.54 x 2.01 inches |
| Package Weight | 0.42 Kilograms |
| Part Number | 50-128 |
| Size | 25.4*450mm |
| UPC | 761560662021 |

## Product Details

- **Brand:** UPANBIKE
- **Color:** Black 450*25.4mm
- **Manufacturer:** UPANTECH
- **Material:** Aluminum
- **Product Dimensions:** 1"W x 17.72"H

## Images

![Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm - Image 1](https://m.media-amazon.com/images/I/51VaHvlryrS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent Length at Great Price. Won't Find a Better Value or Length
*by J***R on September 1, 2020*

I extensively looked for a Replacement Extra Long Seatpost Seat Post. And deceided on the UPANBIKE Bike Bicycle MTB Replacement Extra Long Seatpost Seat Post 17.7inch The 25.4 I ordered was an absolutely perfect fit and at 17.7 inches long, it gave an inch or two more than any others I reviewed. I didn't go wrong. Actually, the UPANBIKE is a much better post than than the one my bike's manufacturer was selling on Amazon. In addition, you can adjust the seat sitting position a few angle. The photos on Amazon show how easy it is to install. No issues whatsoever. Very satisfied with this purchase and a black post goes with any color bike. I am very satisfied for the quality, length, and price value.

### ⭐⭐⭐⭐⭐ Good good quality
*by R***E on October 8, 2025*

perfect seat post replacement, I needed something a little longer, and It looked like it was made by the exact same manufacture that came with my Ebike, it just has a different name on it.

### ⭐⭐⭐⭐⭐ Works great for tall rider of Rad City 5
*by E***T on May 13, 2025*

At 6'6" my son is what I would call a Tall Lad(tm). The seat post on his Rad Power Bikes Rad City 5 + came as 27.2 by 400mm, which at full extension was just barely enough. With this post being 50mm longer, it puts more post in the downtube, reducing the chances of him breaking it. as an added bonus, there are numbered lines on this one so it's easy for him to return it to an exact setting. Solid, easy to install, five stars.

## Frequently Bought Together

- UPANBIKE Bike Seat Post Aluminum Alloy Extra Long 17.7inch(450mm) Replacement Bicycle Seatpost φ 25.4 27.2 28.6 30.4 30.9 31.6mm
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**Shop now:** [https://www.desertcart.co.za/products/44402700-bike-seat-post-aluminum-alloy-extra-long-17-7inch-450mm](https://www.desertcart.co.za/products/44402700-bike-seat-post-aluminum-alloy-extra-long-17-7inch-450mm)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-07*