Things You'll Need
Instructions
Secure your bicycle with the handlebars straight ahead.
Measure the handlebars to find the center, which is located directly over the headset of the bicycle.
Use a tape measure to measure from the center of the handlebars to the center of the fork steerer, which is also called a headset. The center of the headset is marked with a quill bolt if it is threaded or a headset-adjusted bolt on a threadless headset. This gives you the measurements of your bicycle stem.