Columba Long Handlebar Stem (22.1x350mm) This product will fit our RJ26A and SP26S bikes. For people who may want a longer stem, so when they are riding, they are in more relax upward position. The diameter of stem is 22.1 mm, plug into the head tube of a bike. The quick release bolt length is 350mm. Fit with handle bar which has 26 mm diameter at the center. The rest of handlebar diameter should be 22mm.