Bontrager quality and innovation come together in the Race Road Stem. Precision cold-forged 6061-T6 aluminum makes it light and stiff, and the opposing two-bolt steerer clamp keeps it secure. Plus, the CNC-machined 2-bolt faceplate offers a great grip, displays the classic Bontrager logo and makes installation a snap.
Stem length is measured along the side of the stem from the center of the steerer to the center of the handlebar clamp (see diagram). Keep in mind that as a stem provides more rise, its effective length decreases. In the example above, if the +17-degree stem measures 135 mm, it actually extends 108 mm parallel to the ground.