• Origin-8's Quill Adapter allows you to use 1-1/8 inch threadless stems on bicycles with 1-inch threaded forks that take 25.4mm quill stems (stems with bolts in the center)
• The Quill Adapter is made of light and durable 7075 aluminum and features a chromoly bolt
• This adapter allows for the more modern clamp size for most modern handlebars which is the largest advantage of the product
• It also allows for a limited ability to raise your handlebars by as much as 1 inch, resulting in a more comfortable riding position for many

Use 1-1/8" threadless stems on your legacy 1" threaded system. 
25.4mm (quill size) to 28.6mm (stem size)
Now you can use a new lightweight stem on your classic ride