11PCS Bike Carbon Fiber Headset Spacers provide six thickness options for precise stem height adjustment on 1-1/8 inch systems. The spacers have an inner diameter of 28.6 mm and an outer diameter of 34.9 mm to fit standard headsets.

Construction and finish: high-density woven carbon fiber offers strength with lower weight than aluminum. The matte finish reduces glare, while computer-controlled cutting yields smooth edges and tight dimensional tolerance.

Dimensions and quantity: 11 spacers in six sizes: 2×1 mm, 2×2 mm, 2×3 mm, 2×5 mm, 2×10 mm, and 1×15 mm. Precision tolerance ±0.01 mm ensures even stack height.

Applications and compatibility: fits all 1-1/8 inch (28.6 mm) front stem forks, compatible with MTB, road, cruiser, and electric bikes. Stack combinations enable customizable cockpit height and riding posture; spacers resist corrosion and perform across weather conditions.