--- product_id: 61538198 title: "Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18" brand: "profile design" price: "$69.99" currency: USD in_stock: true reviews_count: 5 url: https://www.desertcart.us/products/61538198-converter-1-inch-quill-steerer-to-1-1-8-inch store_origin: US region: United States of America --- # 1 inch to 1-1/8 inch Universal Fit Includes Stems & Converters Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 **Brand:** profile design **Price:** $69.99 **Availability:** ✅ In Stock ## Summary > 🚴‍♂️ Upgrade Your Ride, Elevate Your Style! ## Quick Answers - **What is this?** Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 by profile design - **How much does it cost?** $69.99 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/61538198-converter-1-inch-quill-steerer-to-1-1-8-inch) ## Best For - profile design enthusiasts ## Why This Product - Trusted profile design brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Unisex Design:** Perfect for all riders, making it a versatile addition to any bike enthusiast's toolkit. - • **Easy Installation:** Quick and hassle-free setup, so you can hit the road faster. - • **Transform Your Ride:** Easily convert your 1 inch quill steerer to a modern 1-1/8 inch threadless stem. - • **Durable Construction:** Crafted from high-quality materials for long-lasting performance and reliability. - • **Universal Compatibility:** Designed to fit a wide range of bikes, ensuring you can upgrade without limits. ## Overview The Profile Design Converter allows you to seamlessly transition from a 1 inch quill steerer to a 1-1/8 inch threadless stem, making it an essential upgrade for any cyclist looking to modernize their bike setup. With universal compatibility and easy installation, this converter is perfect for both casual and serious riders. ## Description Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 ## Features - Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem - Department name: Unisex; Included components: Stems & Converters - Universal Fit - ACTHRCONKT18 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0028N14GQ | | Best Sellers Rank | #32,783 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #19 in Bike Stems | | Brand Name | Profile Design | | Color | Silver | | Customer Reviews | 4.5 4.5 out of 5 stars (1,261) | | Date First Available | September 24, 2009 | | Included Components | Stem Column Adaptor | | Item Dimensions LxWxH | 5.75 x 1.25 x 1.5 inches | | Item Package Dimensions L x W x H | 7.44 x 3.23 x 2.24 inches | | Item Weight | 4 ounces | | Manufacturer | Profile Design | | Material | Multi | | Model Name | Threadless Converter | | Model Year | 2016 | | Number of Items | 1 | | Package Weight | 0.19 Kilograms | | Part Number | 15920002 | | Style | Stem Column Adaptor | | Suggested Users | All Ages/Unisex | | Warranty Description | Limited Warranty | ## Images ![Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 - Image 1](https://m.media-amazon.com/images/I/61hGhncU3oL.jpg) ## Questions & Answers **Q: My kid lost that small base piece to his "20" Thruster Dirt DS Boys' Mountain Bike" Will this work as a replacement?** A: It depends on the size of the steer tube and stem sizes. I'd the bike has a one inch threaded steer tube it'll work. But, you may have to get a new stem with a 1 1/8 inch collar. **Q: how many spacers could be fit under this adapter?** A: You don't use spacers for this. You only use spacers for a real threadless setup. This just emulates a threadless and allows you to use a 1-1/8 stem. You just set the height you want and tighten the allen bolt **Q: what stem size does it fit? 1" or 1 1/8"** A: 1 1/8".It inserts into forks with 1 1/8" threaded headsets (actual diameter measurement is 1"). It fits 1 1/8" threadless stems (1 1/8" actual measurement). **Q: How high can you raise the stem above the headset?** A: I have lifted my stem by 25mm from the top of the threaded steerer into which the extender inserts. Done roughly 2500km, including a 500km bike tour over gravel terrain - no issues whatsoever. ## Customer Reviews ### ⭐⭐⭐⭐ 4.0 out of 5 stars good for updating old stems *by P***D on Reviewed in the United Kingdom 🇬🇧 on 17 March 2015* Good way to update a threaded quill stem to modern systems. The 22.2 size fits into the 1" threaded tube on most older bikes ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars VERY GOOD AND WOULD HAVE USED IT BUT FOUND ONE IN ... *by B***N on Reviewed in the United Kingdom 🇬🇧 on 29 April 2015* VERY GOOD AND WOULD HAVE USED IT BUT FOUND ONE IN MY GARAGE AMONG MY "BITS" SO HAVE RETURNED IT IN EXCHANGE FOR MUCOFF 5LTR. HANKS FOR YOUR HELP ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Easi fit *by P***H on Reviewed in the United Kingdom 🇬🇧 on 11 July 2016* Fits easily into a traditional quill stem without a problem. I had more of a problem removing the old stem. ## Frequently Bought Together - Profile Design Threadless Size Converter (1" - 1 1/8") - SHIMANO Universal Standard Brake Cable Set, For MTB or Road Bikes - Park Tool PolyLube 1000 Bicycle Grease --- ## 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/61538198-converter-1-inch-quill-steerer-to-1-1-8-inch](https://www.desertcart.us/products/61538198-converter-1-inch-quill-steerer-to-1-1-8-inch) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*