Profile Design Threadless Converter

This adapter lets you install a modern threadless stem onto an older bicycle frame that uses a traditional quill-style fork. It effectively bridges the gap between vintage fork standards and current stem technology.

The converter is compatible with both 1-inch and 1-1/8-inch steerer tubes. It is designed to fit into the top of your existing quill fork, allowing you to clamp on a standard 1-1/8-inch threadless stem.

Installation is straightforward and typically requires only a standard hex key (Allen wrench) to tighten the wedge bolt inside the steerer tube. You will also need the appropriate tools to install your new stem and handlebars.

Yes, one of the primary benefits of this converter is that it allows you to adjust your handlebar height more easily than a traditional quill stem. Once installed, you can swap stems or add spacers to fine-tune your cockpit position.

This converter is designed to work with stems that fit a 1-1/8-inch steerer tube. As long as your new stem is designed for that standard size, it will clamp securely onto the adapter.