CM|IN
Custom Mosaic GT-1 i55 Titanium Gravel Bike
The Custom Mosaic GT-1 i55 Titanium Gravel Bike
Builds starting from $8,250
Custom, handbuilt frames were the original "gravel" bikes, built around bigger tire clearance but with road-going geometry. The Mosaic GT-1 i55 is the natural successor to these original all-surface machines. 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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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
Gravel Race · 29x2.2
The GT-1 i55 replaces the i45 as Mosaic's gravel race platform, and it's a different frame, not a refresh. The rear triangle is new: a curved seat tube paired with a 3D-printed titanium chainstay yoke, built around Mosaic's own Zero Components Integrated Gravel Fork. None of it is bolted onto the old platform. It's designed as one system, which is how Mosaic gets to 29x2.2 clearance on a 1x-only drivetrain running up to a 48T chainring.
The tubeset is custom 3A/2.5V double-butted titanium, built rider-specific the way every Mosaic is. What's changed is what surrounds it: an IS52/52 tapered head tube, T47x68mm bottom bracket, UDH dropouts at flat mount, and fully integrated routing that requires a gravel-wide chainline.
Winter bike? Gravel racer? Bikepacking? With Mosaic, the possibilities are indeed endless, with a litany of frame options, from fender/rack mounts, pump pegs, and bespoke paintwork. Every Mosaic GT-1 that leaves Above Category is custom-built for the individual, with geometry and tubeset choice based on your answers to our questions about your riding style, current bike setup, riding/racing aspirations, and biomechanical dimensions.
Features
Options
Ordering Process
- Redesigned rear triangle: curved seat tube and 3D-printed titanium chainstay yoke, engineered together rather than adapted from the i45
- Mosaic Zero Integrated Gravel Fork: built exclusively for the i55, paired with ENVE's In-Route cockpit system
- Tire clearance: 700x55mm / 29x2.2, sized around 1x drivetrains only
- Custom-butted titanium tubeset: 3A/2.5V, rider-specific geometry as with every Mosaic frame
- Head Tube: IS52/52 tapered
- Bottom Bracket: T47 x 68mm
- Seatpost: 27.2mm only
- Dropouts: UDH, flat mount
- Routing: Fully integrated, 1x drivetrains only, 48T max chainring, gravel-wide chainline required
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The GT-1 i55 is sold as a frameset module, MSRP starting at $8,250, built to order. Lead time is approximately 8 weeks from order to delivery. Fork inventory on this first production run is limited, so if you're set on the i55, don't wait on it.
Get in touch to start a build.
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.
