Mosaic RT-1 Paints Picture of Future Mosaic RT-1 Paints Picture of Future

Mosaic RT-1 Paints Picture of Future

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Saturday, March 11, 2017

Many elements highlighting the design direction of modern road bikes went into the Mosaic RT-1 hand-built bike on display at this year’s North American Handmade Bicycle Show in Salt Lake City, Utah. 

All photos by John Watson of

The bike was built for Tony Bustamante of Velosmith Bicycle Studio in Wilmette, Ill. Mosaic Cycles, based in Boulder, Colo., hand builds steel and titanium bicycles that are sold exclusively through independent bicycle dealers.

For this build, Bustamante was looking where the road market was going over the next several years to best meet the needs of his customers.

“For our clientele, long distance rides, charity events, one day challenges and weekly group rides make up the majority of use,” Bustamante. “Very few if any of our clients are willing to trade ride comfort for race stiffness. The RT-1 balances these two attributes beautifully.”


Simply put, the pathway ahead for road bikes points toward machines built for the ever-expanding array of applications and adventures cyclists are demanding. At the heart of this are innovations that with design simplicity achieve better braking, wide gearing options, and the capacity to run a wide array of tires for pavement and beyond.

Mosaic’s RT-1 starts with a lightweight double butted titanium tube set for a lightweight frame with a compliant ride that maintains stiffness while delivering quick acceleration. From that foundation springs this bike’s future-looking innovations:


Wireless shifting means no cable stops for a clean look with the performance gains of SRAM RED® eTap® intuitive shifting paired with a WiFLi rear derailleur able to run cassettes up to an 11-32. “WiFLi brings a gearing ample enough for comfort on long rides as well as the range needed to explore. 50/34 and 30t cassette mean any road, any time,” Bustamante said.

Disc brakes provide great stopping power and modulation while also allowing for clearance of tires up to 30mm wide, perfect for gravel or pavement. “We love disc brakes on the front range of Colorado,” said Aaron Barcheck, Mosaic founder and head builder. “We’re always descending and climbing and riding in adverse conditions.”

Tubeless ready setup with the Zipp 303 Firecrest Tubeless-ready Disc brake offers flat protection on Zipp’s first specific-built disc-brake rim. The 303’s 45mm rim depth is an all-around performer that offers aerodynamic efficiency and crosswind stability on the flats and snappy performance on the hills.

Mosaic works through bike shops such as Velosmith to build a bike to the exact fit specifications and riding-style preferences of their customer.

“It adds to the experience that customers get from the purchase, to the fit, to figuring out what parts are going onto the bike, to the finish work, to the build, to the long term service and relationship you’re going to have with your local bike shop,” Barcheck said.

This year, Mosaic is offering new paint schemes through its Spectrum Powder Works such as the tri-color panel and matte on gloss on the Velosmith build.

“That SRAM bike is a great reflection of what we want our brand style to look like,” Barcheck said.

Frame specifications

PF30 bottom bracket

44mm head tube

Integrated 34.9mm seat mast

Mosaic produced titanium seat topper

Internally routed rear brake

12mm thru-axle

Flat mount rear caliper

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