--- product_id: 75348385 title: "UPANBIKE 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: "$46.21" currency: USD in_stock: true reviews_count: 13 category: "Upanbike" url: https://www.desertcart.us/products/75348385-upanbike-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy store_origin: US region: United States of America --- # Extra long 450mm length Micro-adjustable saddle tilt clamp 6061 T6 high-strength aluminum alloy UPANBIKE 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:** $46.21 **Availability:** ✅ In Stock ## Summary > 🚴‍♂️ Elevate your ride, conquer every mile in style! ## Quick Answers - **What is this?** UPANBIKE 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?** $46.21 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/75348385-upanbike-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy) ## 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 - • **Built to Endure:** Crafted from premium 6061 T6 aluminum alloy with 2.5mm tube thickness for unbeatable strength and durability. - • **Tailor Your Comfort:** Micro-adjust clamp lets you fine-tune saddle tilt angle for personalized ergonomic riding. - • **Ride Tall, Ride Proud:** Extra-long 17.7-inch post elevates your saddle for a perfect upright posture—no more uncomfortable forward bends. - • **Universal Compatibility:** Fits most mountain, road, and universal bikes—upgrade your ride without compromise. - • **Precision Fit Every Time:** Available in six diameters with a slightly undersized design for seamless insertion and secure fit. ## Overview The UPANBIKE Extra Long 17.7-inch (450mm) bike seat post is engineered from robust 6061 T6 aluminum alloy, offering a high-strength, lightweight upgrade for taller riders. Featuring a micro-adjustable clamp for precise saddle tilt and available in six diameters, it ensures a perfect fit and enhanced ergonomic comfort across mountain, road, and universal bikes. ## Description Product Description Specifications Material: 6061 T6 Aluminum alloy Color: black Weight: about 380g Length: 450mm Tube thickness: 2.5mm,high strength. Tube Outter diameter: 25.4mm,27.2mm,28.6mm, 30.4mm,30.8mm,31.6mm. Extra Length: Help to raise height of saddle, so that tall rider do not have to bent much forward. Features: Clamp is adjustable for the saddle tilt angle Package includes: 1 X Bike Seatpost SIZE 25.4mm*450mm; 27.2mm*450mm; 28.6mm*450mm; 30.4mm*450mm; 30.8mm*450mm; 31.6mm*450mm; FEATURES Length:450mm Tube thickness:2.5mm,high strength There is a safe insertion line (Please install to the safe line at least) Replacement Seatpost,extended extra long length Clean specification mark Micro-adjust Micro adjustable clamp:you can adjust the tilt angle of the saddle via the clamp to make the saddle horizontal. How to measure and confirm the diameter that you need Please do measure and confirm the exact post diameter that you need for your bike. Otherwise you may find it too small or too large for your bike frame seat post hole, then you'll have to spend more time to return it. Thank you for your support. There are two ways to confirm the diameter that you exactly need. 1. Check the diameter mark on your old seat post, normally there's a size mark on your old seat post. For example, if there's a mark " Φ 25.4"on your old seat post, then you can buy a new 25.4mm seat post. 2. If you have a vernier caliper, measure your old seatpost diameter, or measure the inner diameter of the seatpost hole, then buy a similar size new seat post. For example, if the measurement is about 27.1mm, then select a 27.2mm seat post will do. 3. If you don't have a vernier caliper, use a small stick to measure the inner diameter of the seat post hole (see the picture showing) Installation view(saddle is not included) Note:The diameter number is for frame seatpost hole,the seatpost measures a little smaller than the diameter number marked on the seatpost.e.g: a 25.4mm seatpost measures about 25.0mm~25.2mm only,not exactly 25.4mm. Review: This is a strong tuff post. - My seat post snapped and through me off my bike as I had the 350mm post on max and I'm 6ft tall and 18st. So I bought this new post which is 450mm and I'm very pleased to say is very strong much stronger then my old one. This really is a tuff post. If your looking for a strong long post and don't mind the extra weight then go for it, it seems to be a bargain and on top of that it looks good to. Review: Excellent! - I recently purchased this product and I'm thoroughly impressed! The quality is top-notch, exceeding my expectations. I highly recommend this product to anyone looking for reliability and excellent performance. Five stars all the way! ## Features - To fit frame seatpost hole: 30.9mm,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 | |---------------|-------| | ASIN | B07DD8RSKH | | Best Sellers Rank | 21,621 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 17 in Cycling Seat Posts | | Bike Type | Mountain Bike | | Brand | UPANBIKE | | Brand Name | UPANBIKE | | Colour | Black | | Country Of Origin | China | | Customer Reviews | 4.5 out of 5 stars 1,201 Reviews | | Item Dimensions W x H | 31W x 450H millimetres | | Manufacturer | UPANTECH | | Manufacturer Part Number | 50-128-4AMES | | Material | Aluminium | | Material Type | Aluminium | | Model Number | 50-128-4 | | Product dimensions | 31W x 450H millimetres | ## Images ![UPANBIKE 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) ![UPANBIKE 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) ![UPANBIKE 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) ![UPANBIKE 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) ![UPANBIKE 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** 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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ This is a strong tuff post. *by A***R on 21 February 2019* My seat post snapped and through me off my bike as I had the 350mm post on max and I'm 6ft tall and 18st. So I bought this new post which is 450mm and I'm very pleased to say is very strong much stronger then my old one. This really is a tuff post. If your looking for a strong long post and don't mind the extra weight then go for it, it seems to be a bargain and on top of that it looks good to. ### ⭐⭐⭐⭐⭐ Excellent! *by K***N on 29 April 2024* I recently purchased this product and I'm thoroughly impressed! The quality is top-notch, exceeding my expectations. I highly recommend this product to anyone looking for reliability and excellent performance. Five stars all the way! ### ⭐⭐⭐⭐ 👍🏻 *by I***N on 18 March 2021* Good price an quality and very fast delivery --- ## 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/75348385-upanbike-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy](https://www.desertcart.us/products/75348385-upanbike-extra-long-17-7inch-450mm-bike-bicycle-alluminium-alloy) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-22*