Stay in the know on new releases, special offers, and more.
Considered by many to be one of the finest American titanium framebuilders, Mosaic Cycle's flagship road racer and crown jewel is modestly known as the RT-1. A raw assemblage of titanium, it's where head welder Aaron Barcheck and company have pulled out all the stops from their hermitage in Boulder, Colorado. Designed for timeless durability in all conditions, the RT-1 is a perennial favorite at Above Category as a showcase of bespoke precision domestic manufacturing with relatively rapid availability (approximately eight weeks for a raw-finished frameset).
The RT-1 begins life as a 3/2.5 titanium tubeset, after which the front triangle is custom-butted by Mosaic for the rider - a step many other Ti builders don't bother with (one of the only others is Baum). Why? Weight. And ride. Mated to an oversized 44mm headtube that an ENVE 2.0 fork slides into, the RT-1's front-end can be built as stiff as even the most stout of carbon bikes. Just as well, the rear triangle of the RT-1 is rock-solid, with massive chainstays giving it an instant, drive-by-wire acceleration feel. Internal brake routing is standard on the RT-1, and the new T47 threaded bottom bracket shell is also available as a no-cost option. The RT-1 is also available as a disc brake-equipped bicycle with flatmount disc tabs at no extra charge. All of Mosaic's raw Ti finish options are available, with standard paint schemes also an option for a small upcharge. Full-custom paint and design consultation for the RT-1 is also available.
Every Mosaic RT-1 that leaves Above Category is custom-built for the individual, with geometry and tubeset choice based on your answers to our questions about your riding style, current bike setup, riding/racing aspirations, and biomechanical dimensions.