ACS Maindrive Headset EC34/28.6|EC34/30 Blue Model-Girder HD Your tracker is housed in

Your tracker is housed in a protective 3-part silicone and rubber housing and held in place to Muck-Offs tubeless valve inside the tire completely out of site

3D damping adapts to pelvic motion with minimal pressure and reduced friction Clamp Style Std Rails Color Black/Gray Defined Color Black Gender/Age Men's Length 271 Material Synthetic Saddle Cut Out No Width 181

Pressure Relief Valve upgrade kits available

It does not come with a strap

Will  not fit  XLA

ACS Maindrive Headset EC34/28.6|EC34/30 Blue Model-Girder HD Your tracker is housed inForged steel cups, alloy tops and cap with sealed bearings Available for 1" (25. 4mm) or 1 1 8" (28. 6mm) EC (traditional cup) applications Model Maindrive S. H. I. S. EC34 28. 6 EC34 30 Color Blue Weight 157g Size EC34 28. 6 EC34 30