Use Topeak's Threadless Saw Guide to make a clean cut on your steerer tube. It accommodates between 1-inch and 1 1/4-inch threadless steerer tubes, and can be used on the similar-sized handlebars and seatposts as well. And if you're cutting carbon, the included 2mm spacer gives enough room for a carbon saw blade.
Features and Information
Compatible with 1 1/8-inch threadless steerer tubes