RT-Zero is Mosaic’s most advanced road chassis to date, a complete re-think of their long running ITR platform. By integrating the Zero Ops carbon seatmast with Mosaic’s custom-butted titanium, RT-Zero introduces a new balance of sharp response and long-day comfort. What stands out to us is how it carries forward everything we count on from Mosaic: precision handling, clean lines, rider-first geometry, while adding a new layer of ride tuning that makes the bike feel both quicker and calmer than anything they have built before.

The D-shaped mast and compression-molded topper provide stiffness and comfort in ways a round post cannot. Bridgeless 12 mm seatstays flow into a CNC collar for a clean, aligned junction that rides as refined as it looks.

The full package is modern without compromise. ENVE In-Route fork and one-piece cockpit keep the front end tight, routing is fully internal and a T47 bottom bracket keeps service straightforward. We run 32s in Marin though clearance goes to 35. Geometry is rider specific and this is Mosaic’s lightest road chassis to date.

Mosaic’s CNC details such as dropouts, collars, head tube, and BB plug give every interface a precise feel on the stand and a distinct visual signature up close. The Shadow Titanium finish with painted carbon accents is subtle, with Artist Series options for those who want more.

Read our launch story with Mosaic founder Aaron Barcheck here