CM|IN
Mosaic RT-Zero Road Bike
The Mosaic RT-Zero Road Bike
Builds starting from $15,000
RT-Zero marks a new chapter for Mosaic road, where titanium precision meets carbon discipline. Read more
Above and Beyond
Since 2006, we've been creating the world's finest dream bikes with our signature approach to custom builds and customer service.
Our Custom Program
AC Everywhere
You can find us just over Golden Gate Bridge in California's Marin County. Can’t come to us? We can bring the bike to you. We craft custom bikes for clients all across the U.S. and the world.
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A Premier Partner
Questions about your build? Take advantage of our deep knowledge and unbeatable experience as a premier Mosaic partner.
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Description
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
Features
Options
Ordering Process
- Editions: RT-Zero First Edition (25 framesets)
- Tubeset: 3A/2.5V blend of internally butted and thin wall titanium
- Fork: Enve GRD 1.25" taper
- Headset: Chris King i8
- Brake mount: Flat Mount Disc
- Brake routing: Internal housing
- Axle: 12mm Front, 142 x 12mm Rear
- H20 Mounts: Down tube and seat tube
- Max Tire Size: 700 × 35 mm (optimized around 32 mm)
- Editions: RT-Zero First Edition (25 framesets)
- Geometry: Rider-specific custom
- Finish: Shadow Titanium with painted carbon accents, Artist Series available
- Seatmast: Zero Ops carbon D-shaped mast with compression-molded topper (ENVE hardware)
- Seatstays: 12 mm bridgeless, CNC-machined collar
- Fork: ENVE In-Route with full internal routing
- Cockpit: ENVE SES AR or SES Pro one-piece bar-stem
- Headtube: CNC hourglass IS52/52
- Bottom Bracket: T47 x 68 mm
- Dropouts: CNC flat-mount with UDH
- Tire Clearance: 700 x 35 mm (optimized around 32 mm)
- Routing: Fully internal
- Chassis Weight: Lightest Mosaic road platform to date
- Availability: Pre-order only, deliveries starting February 2026
Whether you’re already set on a certain make and model of frame, or still have some questions about how to go about your build, drop us a line and we can talk through your options. From the first detail to the final finish, we'll help you dial in the perfect set up for your next dream bike.
