You will more than likely have to change your fork to put a threadless stem on it. What kind of bike do you have? Normally threaded forks required threaded headsets which thread into the top of the fork steerer tube. The stem (quill style i assume) inserts into the steerer tube not around it like a threadless stem. Hopefully that makes sense.
A forum community dedicated to cycling and bike riders and enthusiasts. Come join the discussion about troubleshooting, maintenance, training, trails, racing, reviews, accessories, classifieds, and more!