Born from Mosaic’s Zero Ops program, the RT‑Zero builds on the proven performance of our iconic RT‑1 with elevated sophistication, refinement, and ride quality. At its core is our own in‑house engineered carbon seatmast and topper—proudly made in the USA—a hallmark of Mosaic’s commitment to durability and precision. This D‑shaped Zero Ops mast uses a truncated airfoil, or ‘Kamm‑tail,’ profile that reduces aerodynamic drag and, more importantly, lets us fine‑tune stiffness and compliance in ways a round tube cannot.

The Zero Ops seatmast allowed us to recalibrate the RT‑Zero’s custom‑butted titanium tube mix for a distinct look and feel. Bridgeless 12mm seatstays are precisely mitered into the CNC‑machined titanium seat collar and flow seamlessly into the shaped top tube, enhancing ride quality and tunability.

The RT‑Zero carries forward the RT-1 ITR’s 700x35c tire clearance and balanced geometry—light, stiff, and responsive yet stable and predictable on descents. This is a Made-to-Order model with rider-specific tubing, so frame weights vary, but on average this is the lightest Mosaic model to date.

On the road, the RT-Zero delivers an even livelier, more responsive feel during hard efforts and out-of-the-saddle climbs. The oversized downtube and Zero Ops carbon seatmast create an exceptionally stiff bottom bracket and near-instantaneous power transfer. Building on that rigid foundation, the carbon seatmast and topper add critical compliance, delivering something many bikes promise but few deliver: a ride that’s simultaneously smooth and sharp. The RT-Zero wants to be pushed on every rise and roller, and on descents it tracks with the precision and poise Mosaic is known for: stable and confidence-inspiring from the first ride.

Additional refinements include a tapered IS52/52 head tube, flat‑mount UDH dropouts, a T47 bottom bracket shell, and full‑length internal routing—all CNC‑machined from titanium in‑house for uncompromising quality. A compression‑molded carbon topper with premium ENVE hardware completes the D‑shaped seatmast.

The RT-Zero is the first model by Mosaic Zero Ops, the result of over 15 years of titanium frame fabrication combined with countless hours of in-house dreaming, development and testing of these enhancements in the pursuit of the ultimate Mosaic…so far.

A limited production run of 25 first edition RT-Zero framesets, hand-finished with exclusive Zero Ops paint options will be available to order in 2025. The pre-order window is open from August 21st through October 30th, with RT-Zero deliveries beginning in February of 2026. Contact your Mosaic Dealer to secure an RT-Zero slot today or contact us below, then we’ll get to work on perfecting your RT-Zero.

The finish is the first thing we see. And when you’re excited by the sheer look of your Mosaic, it also gets you excited to get out and ride. And that’s what it’s all about. So whether you choose to let the metal be the star of your titanium frame, or opt for a super colorful paint scheme that’s uniquely you, the goal is to come up with a look that’s going to light you up and get you out there. Ready? Let’s make it yours.