Our back yard here in Boulder, Colorado is a paradise for road rides.
France has smooth ribbons of tarmac winding through the Alps into the stratosphere. Kansas offers endless gravel roads stretching to the horizon. In Boulder, you get it all—seamlessly connected. Paved climbs turn to dirt descents, forgotten backroads lead to new adventures, and the best rides blend surfaces without boundaries. This is where the Mosaic RT-1 Integrated Thick Road (ITR) was born.
The Origin of ITR
A few years ago, as disc brakes became standard on road bikes, we noticed a shift. It was more than just more stopping power and modulation—riders were pushing the limits of their road bikes, squeezing in wider tires for extra grip and comfort. But these setups had compromises—tire clearance was tight, handling could feel off, and frames weren’t optimized for the demands of mixed-surface road riding.
Our own rides in Boulder made it clear: We needed a road bike that could handle everything from pristine pavement to the well-worn dirt climbs that define our favorite routes—without sacrificing speed, precision, or ride quality of a proper road bike. Enter the RT-1 ITR.
What Makes the ITR Special?
With the RT-1 ITR, we designed a bike that retains the sharp, responsive handling of the RT-1 D while adding the versatility of 35mm tire clearance. The geometry remains pure road—fast, confident, and built to excel on climbs and descents alike.
Crafted from a double-butted titanium tubeset, the RT-1 ITR is tailored to each rider’s fit and performance needs. It delivers the same lively ride feel as the RT-1 D, now with the added capability to take on varied road surfaces with ease. Thanks to ENVE’s integrated fork and redesigned size-specific chainstays, we’ve ensured that this bike is just as at home hammering up your hardest local Strava climb as it is cruising the lesser-traveled dirt roads beyond town.
Here’s how the RT-1 ITR compares in our lineup:
- RT-1 D: 25-30mm tire clearance
- RT-1 ITR: 30-35mm tire clearance
- GT-1 AR: 32-40mm tire clearance
- GT-1 45: 38-48mm tire clearance
At 415-418mm, the ITR’s chainstays are only slightly longer than the RT-1 D’s, preserving the crisp, high-performance road feel while allowing for a slightly fatter tire, and the greater adaptability on mixed surfaces that comes with it.
Integrated for Performance
Part of what makes the ITR possible is the ENVE In-Route System, which allows us to increase front and rear tire clearance while maintaining the precise geometry we wanted for this model. This is the most well-thought-out integrated front end, and the sleek, modern functionality aligns with the Mosaic ethos of blending handcrafted titanium craftsmanship with cutting-edge performance technology. Plus, cable routing is clean, intuitive, and hassle-free—set it up once, and you’re done.
Most riders will opt for the two-piece cockpit, pairing an ENVE In-Route stem with the ENVE bar of their choice. For those seeking the ultimate integration, we have limited availability of the one-piece ENVE cockpit.
Designed for the Way We Ride
The RT-1 ITR is our go-to for the kind of riding we love—where fast pavement meets forgotten dirt roads, and every ride feels like an adventure. If your ideal route is a blend of speed, endurance, and exploration, this is the bike for you.
Looking for more rugged capability? The GT-1 AR or GT-1 45 might be the better fit. But if your rides demand pure road bike performance with just a little more room to roam, the RT-1 ITR is ready.
