Mosaic GT-1 i55 32-Inch Gravel Bike
A handmade titanium gravel bike designed from the ground up around 32-inch wheels, and built to your measurements.
Mosaic GT-1 i55 32-Inch Gravel Bike
32-inch wheels are not new, but the bikes built around them have mostly been experiments — a bigger wheel pushed into a frame drawn for something smaller, with the handling and the tire clearance paying for it. The GT-1 i55 32 is a new platform instead: geometry, rear triangle, axle standards, 55mm of tire clearance and an in-house Zero Components 32-inch carbon fork, all developed together. Handmade in Colorado from custom double-butted titanium, made to order, and drawn to your own geometry as standard.
BUILDS FROM $13,999.00
A Platform, Not A Conversion
Mosaic did not adapt an existing frame to take a bigger wheel — it started again. The GT-1 i55 32 is built around a custom 3A/2.5V double-butted titanium tubeset with a 3D-printed titanium yoke that clears a 46t chainring on a 1x gravel chainline, a T47 bottom bracket, UDH dropouts, 15x110 and 12x148 thru-axles, and 55mm of tire clearance with room left for mud. Shift and brake lines run fully internally through an integrated IS52 cockpit, with ENVE In-Route stem, seatpost and headset and a Zero Components 32-inch carbon fork developed alongside the frame. Every one is made to order to rider-specific geometry, which is the only honest way to build a bike around a wheel this size — and the part we enjoy most, sitting down with you to get it right.
Why 32 Inches?
Wheels grew from 26 to 29 inches on the trail for a reason, and the same reasoning is what has brought 32 inches to gravel. Here is what the extra diameter actually does — and what it costs.
- It rolls over instead of into — a bigger wheel meets a rock, root or ledge at a shallower angle, so it climbs over what a smaller wheel bumps into. Nothing subjective about it; it is geometry.
- It holds speed on rough ground — every bump you ride over costs energy lifting the bike. Shallower angle, smaller lift, less of your day spent paying for the surface.
- A longer contact patch — at the same tire width, a larger diameter puts a longer, narrower footprint on the ground, which is grip where you want it: braking and cornering on loose surfaces.
- Volume to run soft — 55mm of tire on a wheel this size holds a lot of air, and air pressure you can afford to drop is the cheapest comfort and traction there is.
- Fewer compromises for taller riders — a big frame on 700c wheels is a big frame on relatively small wheels. Proportion is part of why this platform exists.
The honest other side. A bigger wheel is a heavier wheel, so it asks for a little more to get going from a standstill. The tire and rim market at 32 inches is young, so the choice is narrower than 700c and will stay that way for a while. And a wheel this size only fits a rider properly if the frame is drawn around both — which is exactly why the GT-1 i55 32 is made to order to your own geometry rather than sold off a size chart.
This is a new platform, so treat everybody's ride impressions — ours included — as early ones, and be wary of anyone who sounds certain. What we can do is talk it through honestly, work out whether it suits the riding you actually do, and get your geometry right if it does. Come and see us.
THE FINER DETAILS
A BIGGER WHEEL, ON PURPOSE
The 32 in the name is the wheel and the i55 is the clearance: 55mm of tire, with mud room left over. A wheel that size carries speed over rough ground and smooths out what a smaller one trips on, but only if everything else is drawn to suit it — which is why the rear triangle, the axle standards and the Zero Components carbon fork were all developed for this bike rather than borrowed from another. A 3D-printed titanium yoke makes room for a 46t chainring on a 1x chainline.
YOURS TO FINISH
Mosaic's finish work is the part people linger over, and rightly. Raw titanium in Ghost, Shadow or Mosaic Factory; the full range of painted finishes, standard or to your own combination; or the Artist Series, applied by hand and never quite repeated. Choosing is one of the best parts of ordering a custom bike, and it is the part we most enjoy helping with — come and see the finishes in person at Regroup.
About the brand
Mosaic Bikes
Boulder-based Mosaic has been hand-building titanium works of art since 2009. With a range that deftly turns from the road to the trail and even towards the steep drops of the singletrack, a Mosaic stands for impeccable craftsmanship, generous customization and supreme finishing. For those and many more reasons, Mosaic's small, passionate team has earned a deserved reputation as the leading light in American small-batch bike manufacturing.
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