What does the Zoom Q-2 Quill Stem Adaptor do?

The Zoom Q-2 Quill Stem Adaptor lets you run a modern 1-1/8 inch threadless stem on an older 1 inch threaded fork, so you can upgrade your cockpit without replacing the fork. It drops into the threaded steerer like a quill stem, with a 22.2mm quill that fits 1 inch forks, then presents a standard 28.6mm threadless clamp up top for your new stem. This is the simple fix for vintage road bikes, commuters, and restorations where you want the wider stem selection and clean look of a threadless setup.

Built from cold-forged aluminum for strength, the Q-2 also gives you a 23mm height adjustment range, so you can fine-tune bar height as you dial in fit. It is a practical, affordable bridge between old and new standards, ideal for anyone modernizing a threaded-fork bike or sourcing a hard-to-find conversion part. Install it once and your bike gains access to the entire world of threadless stems.