The R‑Series is how Mosaic does road. Nothing rides quite like a bespoke titanium road bike, and our R‑Series models offer that sublime feel along with a level of performance rivaling anything else out there.

Light, lively, and durable, these bikes have never been better—thanks to modern component standards that allow us to run wider, faster, and more compliant tires. The flagship RT‑1iTR—integrated thick road—fits up to 700×35c, making it capable of anything ranging from all‑day roadie rides and Tuesday‑night crits to rough backroads and even mixed surfaces of dirt and gravel.

Standard RT models are nearly as versatile, with tires topping out at 700×30c, and we even have options for those who prefer rim brakes. And for riders looking for the absolute cutting edge in Mosaic road performance, the new limited-run RT‑Zero—born from our Zero Ops program—introduces our proprietary carbon seat mast and topper, highly refined tubeset and new head tube, seat lug and seatstay design and dropouts, making it our most evolved road bike yet.

Every R‑Series frame is purpose‑built for titanium tarmac prowess: race‑ready in rider‑matched, superlight butted thinwall tubing at the RT‑1 level or no‑nonsense straight‑gauge titanium tubing at the batch‑built RT‑2 level, all precision‑crafted for responsiveness, durability, and that unmistakable Mosaic ride feel.