Mosaic GT-1 i55 Puts 3D-Printed Titanium on a Gravel Bike

A Titanium Yoke, Printed to Order

Mosaic Cycles introduced the GT-1 i55, a gravel bike that relies on a 3D-printed titanium rear yoke to fit 29x2.2 inch tires. That is the widest tire clearance Mosaic has offered on a production gravel frame, and the company achieved it without stretching the chainstays or changing the frame's overall shape.

The yoke is the first 3D-printed titanium component Mosaic has ever put on a production bike. The company chose 3D printing because the shape needed to hold the wide tires while keeping the chainstays short and stiff is difficult to make with conventional titanium tubing. A welded or machined bracket would add weight and complexity. The printed yoke does the same job with less material.

The rest of the frame uses Mosaic's signature custom-butted titanium tubing, but the rear triangle is entirely new for the i55. The company redesigned the seatstays, chainstays, and dropouts around the 3D-printed yoke, preserving the responsive ride feel Mosaic riders expect while adding capability on rough terrain.

Mosaic also designed a new gravel fork in-house. It carries the same 55mm tire clearance as the rear, with fully internal cable routing and fender mounts. The frame accepts modern standards: 12x142mm rear axle, 44mm headtube, and a T47 bottom bracket.

The GT-1 i55 is semi-custom. Mosaic draws geometry based on rider fit data, so every frame is built to order. Pricing starts at roughly $8,000 for the frameset, with complete builds climbing well past $15,000 depending on parts selection. That places it firmly in the boutique titanium category, but the 3D-printed yoke shows that even small production runs can justify additive manufacturing when the shape is otherwise impossible to make.