--- product_id: 61538198 title: "Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18" brand: "profile design" price: "FREE" currency: SGD in_stock: false url: https://www.desertcart.sg/products/61538198-profile-design-converter-1-inch-quill-steerer-to-1-1 store_origin: SG region: Singapore --- # Durable aluminium & steel build Lightweight 160g design Precision 1" to 1-1/8" conversion Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 **Brand:** profile design **Price:** FREE **Availability:** ❌ Out of Stock ## Summary > 🚴‍♂️ Upgrade your ride, join the modern cycling elite! ## Quick Answers - **What is this?** Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 by profile design - **How much does it cost?** FREE with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/61538198-profile-design-converter-1-inch-quill-steerer-to-1-1) ## 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 - • **Light as a Feather:** At just 160 grams, it adds minimal weight while maximizing performance - • **Robust Build Quality:** Aluminium body paired with steel bolt ensures lasting durability - • **Optimized Fit & Length:** 135mm total length with precise insert marks for perfect installation - • **Seamless Modern Upgrade:** Transform your vintage bike with a sleek threadless stem fit - • **Universal Compatibility:** Designed for 1 inch quill steerers with 22.2mm internal diameter ## Overview The Profile Design Converter effortlessly adapts 1 inch quill steerer bikes to accept contemporary 1-1/8 inch threadless stems. Crafted from lightweight aluminium with a steel bolt, it offers a durable, precise fit with a total length of 135mm, making it the perfect upgrade for cyclists seeking modern performance on classic frames. ## Description Threadless conversion for threaded forks allowing a larger range of modern stems to be fitted to older bikes Converts a 1 inch quill stem bike to accept 1-1/8 inch threadless stems Aluminium body, steel bolt Weight: 160 grams Total length = 135mm, 42mm at the top is for fitting 28.6mm ahead stem, the remaining 93mm can go inside your head-tube, the min insert mark is 73mm from the bottom Note: This is for a 1 (25.4mm) fork with a 22.2mm internal diameter ## Features - Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem - Department name: Unisex; Included components: Stems & Converters ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0028N14GQ | | Best Sellers Rank | 144,803 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 258 in Cycling Stems | | Customer reviews | 4.5 4.5 out of 5 stars (1,231) | | Date First Available | 12 Aug. 2010 | | Department | Unisex | | Item model number | ACTHRCONKT18 | | Language | English | | Manufacturer | Profile Design | | Product Dimensions | 14.61 x 3.18 x 3.81 cm; 113.4 g | | Release date | 6 Nov. 2018 | ## Images ![Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 - Image 1](https://m.media-amazon.com/images/I/31RH+7XD66L.jpg) ![Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 - Image 2](https://m.media-amazon.com/images/I/216xBAxU2vL.jpg) ![Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 - Image 3](https://m.media-amazon.com/images/I/31DaYQR0A7L.jpg) ![Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 - Image 4](https://m.media-amazon.com/images/I/21zHVEkSajL.jpg) ![Profile Design Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem One Size,ACTHRCONKT18 - Image 5](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. ## 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.sg/products/61538198-profile-design-converter-1-inch-quill-steerer-to-1-1](https://www.desertcart.sg/products/61538198-profile-design-converter-1-inch-quill-steerer-to-1-1) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-10-05*