Originally Posted by sch
I believe the convention is from center of the bolt to the rear of the bar, very
close to the weld but a lot of stems with threadless are not welded but forged.
Will your seat slide forward 1.5cm? Steve
Not really. Since it's welded,the measurement is center of quill to center of bar clamp along the side of the extension. It's 1" threaded and the quill actually measures 22.2. And, you don't shove the seat forward to get proper reach to the bars.