--- product_id: 474150521 title: "EXA Form 900i 30.9mm/31.6mm Internal Routing Dropper Post with Lever and Cable Kit MTB/Ebike Internal Bike Seatpost 100/120/150mm Travel -345/395/445mm Length" brand: "jfoyh" price: "B/.385" currency: PAB in_stock: true reviews_count: 13 category: "Jfoyh" url: https://www.desertcart.com.pa/products/474150521-exa-form-900i-30-9mm-31-6mm-internal-routing-dropper store_origin: PA region: Panama --- # 30.9mm & 31.6mm diameters 7075 aluminum alloy build 100-150mm adjustable travel EXA Form 900i 30.9mm/31.6mm Internal Routing Dropper Post with Lever and Cable Kit MTB/Ebike Internal Bike Seatpost 100/120/150mm Travel -345/395/445mm Length **Brand:** jfoyh **Price:** B/.385 **Availability:** ✅ In Stock ## Summary > 🚵‍♂️ Elevate your ride with precision and style—drop in, stand out. ## Quick Answers - **What is this?** EXA Form 900i 30.9mm/31.6mm Internal Routing Dropper Post with Lever and Cable Kit MTB/Ebike Internal Bike Seatpost 100/120/150mm Travel -345/395/445mm Length by jfoyh - **How much does it cost?** B/.385 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/474150521-exa-form-900i-30-9mm-31-6mm-internal-routing-dropper) ## Best For - jfoyh enthusiasts ## Why This Product - Trusted jfoyh brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Lightweight Strength:** Crafted from aerospace-grade 7075 aluminum alloy for durability that won’t weigh you down. - • **Precision Fit Guarantee:** Choose between 30.9mm and 31.6mm diameters to ensure a perfect, rattle-free installation every time. - • **Seamless Internal Routing:** Designed exclusively for sleek, internal cable routing frames—ditch the clutter and ride clean. - • **Effortless On-the-Fly Adjustment:** Remote lever lets you instantly fine-tune seat height without missing a beat on your trail. - • **Tailored Travel & Length Options:** Customize your ride with 100, 120, or 150mm travel and lengths from 345mm to 445mm—fit your style, your way. ## Overview The EXA Form 900i dropper post is a premium internal routing seatpost designed for mountain and e-bikes, offering lightweight 7075 aluminum construction, precise diameter options (30.9mm/31.6mm), and customizable travel lengths (100-150mm). It includes a smooth remote lever for quick seat height adjustments on the fly, making it ideal for riders seeking performance and clean aesthetics in one upgrade. ## Description desertcart.com : EXA Form 900i 30.9mm/31.6mm Internal Routing Dropper Post with Lever and Cable Kit MTB/Ebike Internal Bike Seatpost 100/120/150mm Travel -345/395/445mm Length : Sports & Outdoors Review: Works for 26" bike for pre-teen, first use of day a bit tight - I have a kid that's getting into Mountain Biking, and put it on a 26" XXS Specialized RockHopper. Installation went as well as could be expected. Two main issues: - On the XXS RockHopper, it has a front derailleur, so finding a good spot for the lever took a bit of trial - The seat hydraulics get stuck the first time of the day, so getting it to extend the first time took some trial. Basically, I put a skinny screwdriver through the lever so I could pull it with my right hand, held the shaft with left hand, and held the other end between my feet and tried pushing/pulling until it unlocked. The provided cable was plenty big enough (I cut off over a foot). The lever hardware seems pretty great, and I didn't feel like I was going to strip any screws or break anything. Adjusting the tightness of the cable went really well due to the two adjustment screws (plenty of tightening room). The kid isn't very strong in the thumbs yet, so the first ride of the day he has to use two hands to "unlock" the stuck piston. After that it is incredibly smooth going up and down, and his left thumb is able to push it in okay enough (it's still tough, but it'll get easier as muscles grow). Again, the seat post does seem to get 'stuck' after sitting there for a day, but then goes super smooth the rest of the day. I'm happy with the post and the installation. It seems like good quality for the price I paid. It definitely isn't as good as the one on my own bike (mine has no 'stuck' issue after prolonged periods of inactivity), but good enough for this starter bike or anyone on a budget that wants a post that will last. I'll update this if I ever hit issues. Review: It works! - I'll admit, my expectations were pretty low because it is cheap and from desertcart. However, so far it is working well and I'm happy. Have only ridden a handful of times, but it is smooth and moves easily even for a lighter rider. I will say the installation instructions could use a little help. It's scary when you have to start cutting cables and the instructions are only 70% clear on how to do it. But it worked, it's installed - now just hoping it lasts. ## Features - For Internal Routing Frames Only – This dropper post is specifically designed for bikes with internal cable routing. Please confirm your frame supports internal routing before purchasing. - Select the Correct Diameter – Available in 30.9mm and 31.6mm. It’s crucial to measure your bike’s seat tube inner diameter and choose the matching size. An incorrect size will not fit. - Smooth Remote-Control Height Adjustment – Includes a remote lever for quick and precise seat height changes while riding, so you can adapt instantly without stopping. - Lightweight & Durable Alloy Construction – Crafted from 7075 aluminum alloy for strength and reliability. Weight ranges from approx. 480g (shortest) to 670g (longest) depending on the length. - Multiple Length & Travel Options – Choose from 345mm/395mm/445mm lengths with 100mm/120mm/150mm travel options to match your bike and riding style. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09YH2PD3K | | Best Sellers Rank | #54,360 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #29 in Bike Seat Posts | | Bike Type | Mountain Bike | | Brand | JFOYH | | Brand Name | JFOYH | | Color | Black | | Customer Reviews | 4.2 out of 5 stars 243 Reviews | | Included Components | Dropper Post Body, Lever Kit | | Item Diameter | 31.6 millimeters | | Item Dimensions W x H | 1.2"W x 17.5"H | | Item Weight | 0.73 kg | | Manufacturer | JFOYH BIKE | | Manufacturer Part Number | BIKE DROPPER SEATPOST | | Material | Aluminum | | Material Type | Aluminum | | Model Number | Diameter: 31.6mm | | Number of Items | 1 | | Product Dimensions | 1.2"W x 17.5"H | | UPC | 774144172076 | | Warranty Description | 12-month Limited Wrranty | ## Product Details - **Brand:** JFOYH - **Color:** Black - **Item Weight:** 0.73 kg - **Material:** Aluminum - **Product Dimensions:** 1.2"W x 17.5"H ## Images ![EXA Form 900i 30.9mm/31.6mm Internal Routing Dropper Post with Lever and Cable Kit MTB/Ebike Internal Bike Seatpost 100/120/150mm Travel -345/395/445mm Length - Image 1](https://m.media-amazon.com/images/I/61D4iUwD08L.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What type of lever is included in the package? 1X lever? 2X lever?** A: It's coming with standard 1x lever. **Q: Is it coming with cable in housing?** A: Yes, it's coming with cable in housing, ahout 1500mm. **Q: How to install this dropper post?** A: The installation process is simple, we have also shot an installation tutorial for you, please watch our product related videos. **Q: Is 900i dropper post only for internal routing frame?** A: Yes, 900i only for internal routinbg frame. **Q: How Much Rotational Play Is Normal?** A: 1-3mm of rotation is normal. Without a bit of wiggle room between the stanchion and the mid cap bushing, the dirt and grime that makes its way into your dropper could do some serious damage. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works for 26" bike for pre-teen, first use of day a bit tight *by M***T on May 15, 2023* I have a kid that's getting into Mountain Biking, and put it on a 26" XXS Specialized RockHopper. Installation went as well as could be expected. Two main issues: - On the XXS RockHopper, it has a front derailleur, so finding a good spot for the lever took a bit of trial - The seat hydraulics get stuck the first time of the day, so getting it to extend the first time took some trial. Basically, I put a skinny screwdriver through the lever so I could pull it with my right hand, held the shaft with left hand, and held the other end between my feet and tried pushing/pulling until it unlocked. The provided cable was plenty big enough (I cut off over a foot). The lever hardware seems pretty great, and I didn't feel like I was going to strip any screws or break anything. Adjusting the tightness of the cable went really well due to the two adjustment screws (plenty of tightening room). The kid isn't very strong in the thumbs yet, so the first ride of the day he has to use two hands to "unlock" the stuck piston. After that it is incredibly smooth going up and down, and his left thumb is able to push it in okay enough (it's still tough, but it'll get easier as muscles grow). Again, the seat post does seem to get 'stuck' after sitting there for a day, but then goes super smooth the rest of the day. I'm happy with the post and the installation. It seems like good quality for the price I paid. It definitely isn't as good as the one on my own bike (mine has no 'stuck' issue after prolonged periods of inactivity), but good enough for this starter bike or anyone on a budget that wants a post that will last. I'll update this if I ever hit issues. ### ⭐⭐⭐⭐⭐ It works! *by C***N on June 9, 2026* I'll admit, my expectations were pretty low because it is cheap and from Amazon. However, so far it is working well and I'm happy. Have only ridden a handful of times, but it is smooth and moves easily even for a lighter rider. I will say the installation instructions could use a little help. It's scary when you have to start cutting cables and the instructions are only 70% clear on how to do it. But it worked, it's installed - now just hoping it lasts. ### ⭐⭐⭐⭐ Buy extra housing! *by B***. on January 23, 2026* I can’t speak for the amount of time it will survive but it installed pretty easy if you have a basic know how of MTB cable installs. The cable was long enough but the housing was too short for my Large Giant Stace E+2. Goes up and down quick. Lever seems decent and it does what I need for the price I want. Can’t imagine spending $200-$300 on a dropper post would make it much better. ## Frequently Bought Together - EXA Form 900i 30.9mm/31.6mm Dropper Post with Remote Lever and Cable Kit MTB/Ebike Internal Routing Dropper Seatpost for Mountain Bike(100mm/125mm/150mm Travel) - JKSPORTS ShimanoOEM BR MT200 Hydraulic Disc Brake Set Front 800mm and Rear 1400mm BR-BL-MT200 Hydraulic Disc Brake Set Front and Rear - FOOKER MTB Pedals Mountain Bike Pedals 3 Bearing Non-Slip Lightweight Nylon Fiber Bicycle Platform Pedals for BMX MTB 9/16" --- ## 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.com.pa/products/474150521-exa-form-900i-30-9mm-31-6mm-internal-routing-dropper](https://www.desertcart.com.pa/products/474150521-exa-form-900i-30-9mm-31-6mm-internal-routing-dropper) --- *Product available on Desertcart Panama* *Store origin: PA* *Last updated: 2026-10-09*