Box Two Centre clamp Hollow stems are cold forged from the highest quality 6061-T6 aluminium available. Featuring an open skeletal design and a dual mid-bolt wedge mounting system, they are lightweight yet maintain a very high level of strength. A 53mm extension stem weighs just 218 grams/7.7 ounces. By removing the rear pinch bolts and moving the mounting bolts to the middle of the stem, we reduced the weight and size and eliminated a serious hazard to the riders knees.

These stems come with either a 48 or 53mm extension and a 22.2mm bar bore. To ensure proper clamping force, the stem must be mounted on a fork with at least 45mm of exposed steerer tube.

Features

• Lightweight Skeleton Design
• Knee-Saving Wedge Centre Clamp System
• Superior Strength

Specifications

• Material:Cold-Forged 6061-T6 Aluminium
• Hardware:Chromoly Clamping Bolts
• Finish:Anodised w/Laser-Etched Graphics
• Length:48mm, 53mm
• Clamp Diameter:22.2mm
• Stack Height:28mm

This stem can be installed either side up to give a 5-degree rise or drop.

Note:Not compatible with forks that have carbon fibre steerer tubes