--- product_id: 288708444 title: "Threadless Size Converter (1\" - 1 1/8\")" brand: "profile design" price: "£28.81" currency: GBP in_stock: true reviews_count: 1 category: "Profile Design" url: https://www.desertcart.co.uk/products/288708444-threadless-size-converter-1-1-1-8 store_origin: GB region: United Kingdom --- # Polished silver finish for sleek aesthetics Approx. 25mm rise increase with spacers Precision fit for 1" to 1-1/8" steerer conversion Threadless Size Converter (1" - 1 1/8") **Brand:** profile design **Price:** £28.81 **Availability:** ✅ In Stock ## Summary > 🚴‍♂️ Elevate your ride with precision and style! ## Quick Answers - **What is this?** Threadless Size Converter (1" - 1 1/8") by profile design - **How much does it cost?** £28.81 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/288708444-threadless-size-converter-1-1-1-8) ## 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 - • **Lightweight & Durable:** Crafted from premium materials to keep your bike agile without added bulk. - • **Sleek Polished Finish:** Stand out with a high-gloss silver look that complements any bike style. - • **Boost Your Ride Height:** Gain up to 25mm rise for enhanced comfort and control using spacers. - • **Seamless Compatibility:** Effortlessly upgrade your bike with a perfect 1" to 1-1/8" threadless stem fit. - • **Universal Fit for All Riders:** Designed unisex and compatible with most quill steerers for versatile use. ## Overview The Profile Design Threadless Size Converter transforms a 1" quill steerer to fit a 1-1/8" threadless stem, featuring a polished silver finish and enabling up to 25mm rise increase with spacers. Lightweight and universally compatible, it’s the perfect upgrade for cyclists seeking enhanced fit and sleek aesthetics. ## Description Profile Design Conversion has a polished silver finish. Features: For installing threadless stems on a threaded fork Approximately 25mm rise increase possible if used with spacers Polished silver finish Quill Insertion Diameter: 25.4mm for 1 1/8" stems and 22.2 for 1" stems Steerer Clamp OD 25.4mm, for 1", 28.6mm fir 1-1/8. Review: Wrong size in packaging - It is 1"(25.4mm) -1/8 on the packaging but actual item inside is 22.2 diameter. What I needed is bigger diameter not this one that I received☹️☹️☹️ ## Features - Converter: 1 inch Quill steerer to 1-1/8 inch threadless stem - Department name: Unisex; Included components: Stems & Converters ## Technical Specifications | Specification | Value | |---------------|-------| | Color | silber | | Size | One Size | | Hand Orientation | Right | | Height | 1 inches | | Length | 8 inches | | Width | 3.25 inches | | Shape | Round | | Material Type | Plastic | | Number of Items | 1 | | Usage | Bicycle | | Sport | Cycling | | Included Components | Stems & Converters | | Batteries Included? | No | | Brand | Profile Design | | Department | Unisex | | Manufacturer | Profile Design | | Language | English | | Item model number | ACTHRCONKT18 | | Product Dimensions | 14.61 x 3.18 x 3.81 cm; 113.4 g | | ASIN | B0028N14GQ | ## Images ![Threadless Size Converter (1" - 1 1/8") - 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 ### ⭐ Wrong size in packaging *by E***G on 24 March 2022* It is 1"(25.4mm) -1/8 on the packaging but actual item inside is 22.2 diameter. What I needed is bigger diameter not this one that I received☹️☹️☹️ ## 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.co.uk/products/288708444-threadless-size-converter-1-1-1-8](https://www.desertcart.co.uk/products/288708444-threadless-size-converter-1-1-1-8) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-19*