Dimension Quill Stem Adaptor The Dimension Quill Stem Adaptor allows you to use an 1 1/8" threadless stem on a bike/fork that would normally use a 1" threaded (quill) stem. If you have an older style bike with a quill stem but you'd rather run a modern threadless stem, this adapter is perfect for your situation. Features Converts 22. 2mm (1" Fork) - 28. 6mm (11/8" Threadless)Do not install adapter above min. insertion line Allows for a threadless stem to work with a threaded fork Total quill length: 180mm | Dimension | Quill Stem Adaptor 22. 2Mm (1" Fork) - 28. 6Mm (11/8" Trdlss)