--- product_id: 259984093 title: "UPANBIKE 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: "$31.41" currency: USD in_stock: true reviews_count: 7 category: "Upanbike" url: https://www.desertcart.us/products/259984093-upanbike-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black store_origin: US region: United States of America --- # 350mm length - optimal height range 4 diameter sizes - perfect fit guaranteed 6061 aluminum alloy - ultra durable UPANBIKE 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:** $31.41 **Availability:** ✅ In Stock ## Summary > 🚴‍♂️ Elevate your ride, dominate every trail. ## Quick Answers - **What is this?** UPANBIKE 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?** $31.41 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-upanbike-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black) ## 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 - • **Effortless Upgrade:** Simple installation compatible with most saddles (clamp sold separately) for a quick performance boost. - • **Precision Safety Mark:** Integrated safe line ensures secure installation and peace of mind on every ride. - • **Engineered for Endurance:** Crafted from high-strength 6061 aluminum alloy for lasting performance and lightweight agility. - • **Streamlined Riding Posture:** 350mm length enables an aerodynamic forward-leaning position to reduce drag and boost speed. - • **Tailored Fit, Zero Guesswork:** Available in four precise diameters (25.4mm, 27.2mm, 28.6mm, 31.6mm) to seamlessly match your bike frame. ## Overview The UPANBIKE Aluminum Alloy Bike Seat Post is a robust, lightweight 350mm seatpost made from premium 6061 aluminum alloy. Designed for mountain and fixed gear bikes, it offers four diameter options to ensure a perfect fit. Featuring a safety insertion line and compatibility with most saddles, it enhances riding posture by enabling a forward-leaning position that reduces drag. Ideal for riders seeking durability, precision, and performance upgrades. ## Description specification: Material:6601 Aluminum alloy Diamter:25.4 mm 27.2 mm 28.6 mm 31.6 mm Length:350 mm Wall Thickness:3 mm Color:Black Weight:About 170 g Package Included: 1 x Bike Seatpost Characteristic 1.The material of this seatpost is a high strength aluminum alloy 6061,manufactured by integral forging. 2.Easy Installation: It is easy to install the saddle on this seat post. 3.With the general specification of the dimensions of the clamp,it fits most of the saddles (the four sizes commonly used for you). 4. There is a safety line logo, adjustment is easy. 5. By raising the saddle height, a forward leaning riding position is born, even if the air resistance (drag) is reduced. Review: Excellent size and quality - Perfect size and excellent quality Review: Excellent - As described and fast delivery. ## 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 | |---------------|-------| | ASIN | B0789GQ412 | | Bike Type | Mountain Bike | | Brand | UPANBIKE | | Brand Name | UPANBIKE | | Color | Black | | Colour | Black | | Customer Reviews | 4.5 out of 5 stars 2,500 Reviews | | Manufacturer | UPANTECH | | Manufacturer Part Number | 50-188-N | | Material | Aluminum | | Material Type | Aluminum | | Model Number | 50-188-N | | UPC | 767452332928 | ## Product Details - **Brand:** UPANBIKE - **Colour:** Black - **Manufacturer:** UPANTECH - **Material:** Aluminum - **UPC:** 767452332928 ## Images ![UPANBIKE 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) ![UPANBIKE 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) ![UPANBIKE 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) ![UPANBIKE 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) ![UPANBIKE 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) ## 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent size and quality *by A***R on 3 April 2021* Perfect size and excellent quality ### ⭐⭐⭐⭐⭐ Excellent *by D***8 on 18 August 2020* As described and fast delivery. ### ⭐⭐⭐⭐⭐ Good post at a great price! *by A***E on 20 March 2026* I ordered this as I replaced an angled seat with another one that required a straight post. It fit perfectly and attached easily to the seat. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/259984093-upanbike-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black](https://www.desertcart.us/products/259984093-upanbike-aluminum-alloy-bike-seat-post-length-350mm30-8mm-black) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-24*