--- product_id: 230170675 title: "Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling" brand: "triwonder" price: "€ 45.08" currency: EUR in_stock: true reviews_count: 13 category: "Triwonder" url: https://www.desertcart.hr/products/230170675-bike-stem-25-4-31-8-adjustable-90-110-130 store_origin: HR region: Croatia --- # Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling **Brand:** triwonder **Price:** € 45.08 **Availability:** ✅ In Stock ## Quick Answers - **What is this?** Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling by triwonder - **How much does it cost?** € 45.08 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/230170675-bike-stem-25-4-31-8-adjustable-90-110-130) ## Best For - triwonder enthusiasts ## Why This Product - Trusted triwonder brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description desertcart.com: TRIWONDER Bike Stem 25.4 31.8 Adjustable 60 Degree 90mm 110mm 130mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling Review: Get the right size, take your time, and you won't be disappointed! - I will start by saying my wife is petite. She is 4' 11" in height. This makes it difficult for her to find a decent fit with a quality E-Bike. We managed to find the closest fit, then we needed to make some modifications to accommodate her relatively small frame. That is where this bike stem comes into the story. Last year, I purchased one for my E-Bike to allow me to sit a bit more upright. It worked for me, so we measured her stem and handlebars, then selected the longest unit with those measurements. I am a firm believer that the few poor reviews are from individuals who failed in one or more of these following things to keep in mind: 1. The material is aluminum, therefore softer than steel and needs to be treated as such. That does not imply it is junk. I found it to be very good quality. You just need to pay attention to not cross the threads and properly torque the allen screws in the correct order without bottoming out any before starting the others. That will help prevent crossed threads. If you do manage to cross the threads, you have drastically reduced the reliability of this stem. 2. The measurements are absolutely critical. You must get the exact size for your bike. If you fail in this step, it will not be compatible with your bike. 3. Do NOT try to adjust the angle between the detents. Select an angle that is exactly one detent or another. Trying to fine tune it in between, will be detrimental to your goal and cause damage to the part. 4. Take your time, and adjust everything for the correct fit before final tightening. There are only two sizes of allen wrenches required, and both come with the kit. Maybe the tools are not the highest "tool-truck" quality, but they will certainly suffice for this job. If you do not feel comfortable working a couple of hand tools, then it should not be a problem to find a handy neighbor or friend to do the job in return for an adult beverage. I took my time and did this in a poorly lit and heated garage, but even then it only took about 20 minutes. Once you have successfully gotten this installed, you will find it has great stability and is quite solidly built. It grips the fork and handle bars tightly and my wife is very happy with the final fit and appearance. I see no reason to give this less than the full five stars. If anything should happen to change my opinion, I will return to update this review accordingly. Review: Like it. - Seems good and sturdy. No issues on bike. Able to adjust handle bar height easily. ## Features - Size: Fits 31.8mm (1-1/4") handlebars and 28.6mm (1-1/8") steerer tube. Available in 90 / 110 / 120mm lengths (measured center to center, not total stem length), with 0–60° adjustable angle - Easy Height Adjustment: Easily adjust the handlebar angle without removing the bike stem, perfect for riders who want to fine-tune their position for better posture, visibility, and control - Easy To Install: Includes clear specs, an angle indicator, and all the tools you need. The 4-bolt clamp securely locks your handlebars in place—no slipping, no fuss - Ride Longer In Comfort: Whether you're commuting or touring, this bike handlebar extender helps relieve back, neck, and wrist discomfort by letting you ride in a natural position. Perfect for riders dealing with shoulder or back pain - Built Strong For Everyday Use: Crafted from high-strength 3D forged alloy for durability and control, this stem stands up to road bikes, MTBs, BMX, and more—durable, dependable, and budget-friendly ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08F7PHCJH | | Best Sellers Rank | #20,654 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #8 in Bike Stems | | Bike Type | Mountain Bike, Road Bike | | Brand | TRIWONDER | | Brand Name | TRIWONDER | | Color | 01 Black - Fit 31.8mm Handlebar | | Customer Reviews | 4.6 out of 5 stars 3,599 Reviews | | Item Dimensions L x W | 4.72"L x 1.25"W | | Item Weight | 0.29 kg | | Manufacturer | TRIWONDER | | Manufacturer Part Number | OS0908 | | Material | Aluminum | | Material Type | Aluminum | | Model Number | OS0908 | | Number of Items | 1 | | Number of Packs | 1 | | Product Dimensions | 4.72"L x 1.25"W | ## Images ![Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling - Image 1](https://m.media-amazon.com/images/I/61nP6DbeeKL.jpg) ![Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling - Image 2](https://m.media-amazon.com/images/I/71xi4OwBUCL.jpg) ![Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling - Image 3](https://m.media-amazon.com/images/I/61fd5prr6kL.jpg) ![Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling - Image 4](https://m.media-amazon.com/images/I/71+TKLSOBhL.jpg) ![Bike Stem 25.4 31.8 Adjustable 90/110/130/145mm Bike Handlebar Extender Stem Riser Bicycle Handle Bar Extensions for Mountain Bike, Road Bike, MTB, BMX, Cycling - Image 5](https://m.media-amazon.com/images/I/71s3vAysxPL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Get the right size, take your time, and you won't be disappointed! *by K***L on April 7, 2026* I will start by saying my wife is petite. She is 4' 11" in height. This makes it difficult for her to find a decent fit with a quality E-Bike. We managed to find the closest fit, then we needed to make some modifications to accommodate her relatively small frame. That is where this bike stem comes into the story. Last year, I purchased one for my E-Bike to allow me to sit a bit more upright. It worked for me, so we measured her stem and handlebars, then selected the longest unit with those measurements. I am a firm believer that the few poor reviews are from individuals who failed in one or more of these following things to keep in mind: 1. The material is aluminum, therefore softer than steel and needs to be treated as such. That does not imply it is junk. I found it to be very good quality. You just need to pay attention to not cross the threads and properly torque the allen screws in the correct order without bottoming out any before starting the others. That will help prevent crossed threads. If you do manage to cross the threads, you have drastically reduced the reliability of this stem. 2. The measurements are absolutely critical. You must get the exact size for your bike. If you fail in this step, it will not be compatible with your bike. 3. Do NOT try to adjust the angle between the detents. Select an angle that is exactly one detent or another. Trying to fine tune it in between, will be detrimental to your goal and cause damage to the part. 4. Take your time, and adjust everything for the correct fit before final tightening. There are only two sizes of allen wrenches required, and both come with the kit. Maybe the tools are not the highest "tool-truck" quality, but they will certainly suffice for this job. If you do not feel comfortable working a couple of hand tools, then it should not be a problem to find a handy neighbor or friend to do the job in return for an adult beverage. I took my time and did this in a poorly lit and heated garage, but even then it only took about 20 minutes. Once you have successfully gotten this installed, you will find it has great stability and is quite solidly built. It grips the fork and handle bars tightly and my wife is very happy with the final fit and appearance. I see no reason to give this less than the full five stars. If anything should happen to change my opinion, I will return to update this review accordingly. ### ⭐⭐⭐⭐⭐ Like it. *by B***I on September 4, 2026* Seems good and sturdy. No issues on bike. Able to adjust handle bar height easily. ### ⭐⭐⭐⭐⭐ Quality bike part *by K***R on July 24, 2026* Worth every penny. I am much more comfortable riding. It fit perfectly and was easy to install. --- ## 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.hr/products/230170675-bike-stem-25-4-31-8-adjustable-90-110-130](https://www.desertcart.hr/products/230170675-bike-stem-25-4-31-8-adjustable-90-110-130) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-10-24*