ACS Maindrive Headsets Model=Tubeless Rim Valves Easily serviceable with a T10

Easily serviceable with a T10 Torx and pick or pen knife

5" Baseplate

Improved High-Speed Compression in Mid-Stroke to eliminate "dead or overdamped feel" and optimized spring progression via stroke-specific Step Progressive Bottoming Bumpers

Tubeless ready for flat prevention traction at low pressures and comfort TPI 60 Color Black

ACS Maindrive Headsets Model=Tubeless Rim Valves Easily serviceable with a T10Forged steel cups, alloy tops and cap with sealed bearings Available for 1" (25. 4mm) or 1 1 8" (28. 6mm) EC (traditional cup) applications Color Black Bearing Type Cartridge Crown Race 30 Defined Color Black S. H. I. S Upper EC34 S. H. I. S. Stem Clamp Diameter 28. 6 Threadless S. H. I. S Lower EC34