Mosaic has added a new titanium gravel platform to its lineup: the GT i55 32, developed around 32-inch wheels and available through the company’s Made to Order program.
The important phrase is developed around. This is not an existing Mosaic gravel frame with extra room added wherever the larger wheels needed it. Mosaic designed the geometry, rear triangle, axle standards, tire clearance, and fork together as a 32-inch-wheel system.
That distinction is the story of the bike. A larger wheel touches too many parts of a gravel frame for a thoughtful design to begin and end at clearance.
The wheel size set the terms of the frame
The GT i55 32 clears 32-inch gravel tires up to 55mm, or 2.2 inches. Creating that space required Mosaic to reconsider the area behind the bottom bracket, where tire, chainring, seat tube, and chainstays all compete for room.
The resulting rear triangle uses 440–445mm chainstays, an offset seat tube, and a 3D-printed titanium yoke. Together, those choices make room for the larger tire while retaining a standard gravel chainline and clearance for a chainring up to 46 teeth.
The axle standards change with the platform, too: 148x12mm at the rear and 110x15mm at the front. Those dimensions are part of the bike’s foundation, not accessories selected after the frame was drawn.
Then there is the fork. Mosaic developed the Zero Components 32-inch Gravel Fork in-house for this platform, with a 445mm axle-to-crown measurement and 60mm offset. In other words, the front of the bike was not handed off to a generic fork after the rear triangle was solved. Frame and fork belong to the same design brief.
That is what “purpose-built for 32-inch wheels” means here. It is a series of connected decisions, visible in the hard points of the bike.
One platform, two Made to Order versions
The GT i55 32 arrives in two forms. Both are titanium gravel frames built around the same wheel format and 55mm tire clearance. Their tubesets, bottom brackets, cable-routing systems, and starting prices distinguish them.
GT-1 i55 32 uses a rider-specific, double-butted titanium tubeset. It has a T47 bottom bracket, fully internal routing, and an IS52 headtube. Frame-and-fork pricing starts at $8,250.
GT-2 i55 32 uses straight-gauge titanium tubing. It has a BSA bottom bracket, semi-integrated routing through a Cane Creek HCR system, and the same IS52 headtube standard. Frame-and-fork pricing starts at $5,000.
These are not complete-bike prices. At Alpha, the professional fit is $600, build labor is $600, and sales tax is separate. Components and finishing choices are specified after the fit, so the finished-bike total follows the actual build rather than a display-floor package.
That order matters on a platform this new. A 32-inch wheel may be the reason to begin the conversation, but it does not decide whether the GT-1 or GT-2 expression is right for a particular rider. Fit, position, intended terrain, component choices, and the frame details a rider values still shape the answer.
Where the GT i55 32 begins at Alpha
Alpha carries Mosaic because Made to Order gives us room to begin with the rider rather than a bike sitting on a sales floor. The GT i55 32 follows that same path.
We start with a professional fit. From there, we can determine whether the platform belongs in the conversation, which version makes sense, and how the contact points and components should be specified. If the GT-1’s rider-specific tubeset is the right direction, that discussion happens from fit data and riding goals—not from a guess based on height or a familiar size label.
Questions about the Mosaic GT i55 32 or how a Made to Order build begins? Let us know.
