Cervelo HB19 One-Piece Bar/Stem

The Cervelo HB19 One-Piece Bar/Stem is the integrated carbon cockpit Cervelo fits to its S5 aero road bike. Bar and stem are a single carbon piece, so there is no clamp between them and the front end has a clean, uncluttered shape.

The bar has a 75mm reach and a 125mm drop, with a 7-degree flare in the drops. Cervelo offers the HB19 in a range of stem lengths, starting at 80mm, paired with different bar widths, so you can match the cockpit to your fit rather than adjusting around a single size. Because the stem is part of the bar, getting the length right at purchase matters more than it does with a two-piece setup.

This is a road cockpit for riders who want an integrated, race-oriented front end. Cervelo advises against attaching clip-on aero extensions to the HB19 and does not cover resulting damage under warranty, so it suits road and group-ride use rather than time trial setups.