evo.com | Fidlock Computers > The Fidlock Vacuum Head Cap Base was designed for installation into your bike's headset, allowing you to securely affix your phone in an easily accessible spot on all your rides - whether on dirt or pavement! Please Note This is a 2 part system; you will need a patch or phone case for the vacuum to work. For Installation on Bike Head Cap Compatible with all Fidlock Vacuum Cases No Interference with Electronics Fits All 1 1/8" Threadless Headsets | Fidlock Vacuum Head Cap Base 2025 in Black