Ahead- and Quill-Stems
The stem on a bike connects the handlebars and steerer tube. The shape, the length and the angle of the stem define both the handling of the bike and the seating position of the rider. There are roughly two different types of stems: steerer stems and ahead stems. We generally use steerer stems on classic bicycles with forks with a 1" threaded steerer tube and threaded headset. The stems sits inside the steerer tube and are fastened with a clamping or expanding wedge. Threadless stems are now standard straight in the area of sporty bicycles. In contrast to steerer tube stems, Ahead stems clamp on the outside of the steerer tube. The inner diameter of the stem must correspond to the outer diameter of the steerer tube. With a few exceptions, the dimension is 1 1/8". For forks and frames with 1 1/8" Ahead systems that use Ahead stems HERE you will find a wide selection of possible headsets.
The stem on your bike, together with the geometry of your frame, greatly influences the handling and ride of your bike. The geometry of the stem (length, angle) allows your bike to be adapted to a high degree to your individual needs, preferences or necessities. The geometry of the stem in combination with the handlebar used determine the posture of the rider on the bike from very sporty aerodynamic overstretched to very comfortable upright. The choice of the right length depends on the size or geometry of your frame and your individual physical requirements (torso and arm length). We at BIKE PUNK offer you various stems of the brands BLB, CINELLI, Thomson, DEDA Elementi and Dia Compe in different geometries, colors and qualities.