---
product_id: 259984093
title: "Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose"
brand: "upanbike"
price: "$32.63"
currency: USD
in_stock: true
url: https://www.desertcart.us/products/259984093-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black-mountain
store_origin: US
region: United States of America
---

# 4 diameter sizes - tailored precision 350mm length - perfect fit & posture 6061 aluminum alloy - ultra durable Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose

**Brand:** upanbike
**Price:** $32.63
**Availability:** ✅ In Stock

## Summary

> 🚴‍♂️ Elevate your ride with precision and style — don’t just bike, UPANBIKE it!

## Quick Answers

- **What is this?** Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose by upanbike
- **How much does it cost?** $32.63 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/259984093-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black-mountain)

## 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

- • **Sleek & Stealthy:** Matte black finish adds a modern, professional look to your mountain or fixed gear bike.
- • **Effortless Installation:** Designed for easy saddle mounting and compatibility with most standard clamps (sold separately).
- • **Engineered for Endurance:** Crafted from high-strength 6061 aluminum alloy for unmatched durability and lightweight performance.
- • **Optimized Riding Posture:** 350mm length with a clear safety line ensures ideal saddle height for aerodynamic, forward-leaning rides.
- • **Precision Fit, Maximum Comfort:** Available in four popular diameters (25.4mm, 27.2mm, 28.6mm, 31.6mm) to perfectly match your bike’s needs.

## Overview

The UPANBIKE Aluminum Alloy Bike Seat Post is a robust, lightweight 350mm seatpost made from premium 6061 aluminum alloy. Available in four diameters to fit most mountain and fixed gear bikes, it features a safety insertion line for secure adjustment and a sleek black finish. Designed for durability and optimized riding posture, this seatpost is the perfect upgrade for riders seeking performance and style.

## Description

Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose

## Features

- 【PAY ATTENTION】Please do measure the actual required diameter before purchasing. Saddle clamp is not included, please buy the saddle clamp separately if needed.
- 【MATERIAL】Seatpost made of 6061 aluminum alloy,strong and durable.
- 【SIZE】Length:350mm;Diameter:25.4mm 27.2mm 28.6mm 31.6mm;Thickness of the tube:3mm.
- 【USE&FIT】Seatpost used for for most old style bike,and the bike saddle with clamp.
- 【SAFE LINE MARK】There is a safe line mark on the seat post. Please insert at least above the minimum safety line.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| UPC | 767452332928 |
| Bike Type | Mountain Bike |
| Color | Black |
| Size | 25.4mm*350mm |
| Material Type | Aluminum |
| Batteries Included? | No |
| Item model number | 50-188-N |
| Product Dimensions | 2.54 x 2.54 x 35.05 cm; 159 g |
| ASIN | B0789GQ412 |

## Product Details

- **Colour:** Black
- **Item weight:** 0.16 Kilograms
- **Material:** Aluminum
- **Brand:** UPANBIKE
- **Manufacturer:** UPANTECH

## Images

![Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose - Image 1](https://m.media-amazon.com/images/I/41cpgcgt8fL.jpg)
![Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose - Image 2](https://m.media-amazon.com/images/I/61XgyyRhkKL.jpg)
![Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose - Image 3](https://m.media-amazon.com/images/I/51pH2gEWuZL.jpg)
![Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose - Image 4](https://m.media-amazon.com/images/I/21OdTCIodML.jpg)
![Aluminum Alloy Bike Seat Post Length 350mm30.8mm Black for Mountain Bike Fixed Gear Bike Seatpost Four Sizes for You to Choose - Image 5](https://m.media-amazon.com/images/I/61I8Cy9+SKL.jpg)

## Available Options

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

## Questions & Answers

**Q: What is the top dimension of the 25.4mm post.**
A: The top part (the narrower part) for holding the clamp, it's diameter is about 22.15mm.

**Q: Help! 25.4mm is too thin that it falls into the frame and I can’t tighten around the seat post any tighter.  What should I do?**
A: If you're set on keeping this post, you could always purchase shims

**Q: My seat clamp says 25.4-28.6. What does that mean and will this post fit with seat clamp?**
A: The post that i ordered was 27.2 so your clamp can fit into when you tighten it

**Q: Will a 30 fit a 31.8**
A: If you are asking will a 30mm seakt post fit a 31.8 mm ophening in frame- no.

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**Shop now:** [https://www.desertcart.us/products/259984093-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black-mountain](https://www.desertcart.us/products/259984093-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black-mountain)

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-14*