Mosaic GT-1 i55 Titanium Frameset

Mosaic’s most capable titanium gravel platform, engineered around massive tire clearance, modern integration, and race-ready performance.

Overview

The Mosaic GT-1 i55 is a performance-focused titanium gravel frameset designed for riders who want greater capability without sacrificing speed, responsiveness, or precision. Built using Mosaic’s 3A/2.5V double-butted titanium tubeset, the GT-1 i55 combines the unmistakable ride quality of titanium with a completely redesigned chassis engineered for modern gravel riding.

At the center of the design is clearance for tires up to 700×55mm—the most of any Mosaic model. A 3D-printed chainstay yoke, offset seat tube, and proprietary carbon gravel fork allow the GT-1 i55 to accommodate high-volume tires while maintaining compact 430mm chainstays and responsive handling.

Fully integrated brake routing through the cockpit and downtube completes the clean, modern aesthetic while protecting cables from the elements.

Frame Design & Ride

The GT-1 i55 is built to go faster when the terrain gets rougher.

Its high-volume 55mm tire capability provides increased traction, comfort, and control across loose gravel, technical descents, broken surfaces, and demanding race courses. Despite the additional clearance, the frame retains the direct power transfer and lively ride character expected from Mosaic’s Level 1 double-butted titanium construction.

A suspension-corrected Mosaic carbon gravel fork, 430mm chainstays, and gravel-focused geometry create a composed platform at speed while preserving the responsiveness needed for aggressive riding and racing.

The result is a titanium gravel bike that feels exceptionally capable without losing the precision and connection that define a Mosaic.

Key Features

• 3A/2.5V double-butted titanium tubeset

• 700×55mm tire clearance

• 3D-printed titanium chainstay yoke

• Offset seat tube for increased tire clearance

• Mosaic proprietary suspension-corrected carbon gravel fork

• Fully integrated cockpit and brake routing

• ENVE In-Route integrated stem and seatpost

• Gravel-focused geometry with 430mm chainstays

• Di2 or wireless AXS drivetrain compatibility

• Available in Mosaic’s Batch Built and Made to Order programs

Technical Details

• Frame Material: 3A/2.5V Double-Butted Titanium

• Tire Clearance: 700×55mm

• Head Tube: IS52/IS52

• Bottom Bracket: T47 68mm

• Seatpost Diameter: 27.2mm

• Fork: Mosaic Carbon Gravel Fork, Suspension Corrected

• Brake Mounts: 140mm Flat Mount / 160mm with adapter

• Axle Spacing: 12×100 front / 12×142 rear

• Shift Routing: Internal Di2 or wireless AXS

• Brake Routing: Fully integrated through cockpit and downtube

• Chainstay Length: 430mm

• Integrated Components: ENVE In-Route stem and seatpost

Ideal Use

• Performance gravel riding and racing

• Technical and high-volume gravel terrain

• Long-distance mixed-surface riding

• Riders seeking maximum tire clearance without sacrificing responsive handling

• Riders who want modern integration with the durability and ride quality of titanium

Custom Order Information

The GT-1 i55 is available through Mosaic’s Batch Built and Made to Order programs.

Batch Built frames combine Mosaic’s titanium construction with standard sizing and selected finishes for faster availability.

For riders seeking a more personalized experience, Made to Order frames can be configured with rider-specific geometry and custom finish options, allowing the GT-1 i55 to be tailored around your fit, riding style, and aesthetic preferences.

The price shown represents a pre-order deposit toward your Mosaic frame.

Final pricing may vary based on specifications, finish, and selected options. The remaining balance will be due once your order is complete and ready for pickup.

Please contact Category One Cycles prior to ordering for assistance with sizing, geometry, finish options, build specifications, current lead times, or the custom ordering process.

For sales inquiries or custom build consultations, reach us at info@categoryonecycles.com.

For service appointments, repairs, or bike fitting, contact service@categoryonecycles.com.

You can also reach us by phone at (610) 509-3554