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So far it’s a solo ride.

Custom Mosaic RT-1 Titanium Road Bike

Custom Mosaic RT-1 Titanium Road Bike

The Custom Mosaic RT-1 Titanium Road Bike

Builds starting from $7000

Designed for timeless durability in all conditions, the RT-1 is a perennial favorite at Above Category, a showcase of bespoke precision and exceptional domestic manufacturing. Read more

Above and Beyond Since 2006, we've been creating the world's finest dream bikes with our signature approach to custom builds and customer service. Our Custom Program
AC Everywhere You can find us just over Golden Gate Bridge in California's Marin County. Can’t come to us? We can bring the bike to you. We craft custom bikes for clients all across the U.S. and the world. Contact us
Premier Partner Questions about your build? Take advantage of our deep knowledge and unbeatable experience as a premier Mosaic partner. Contact us
Custom Mosaic RT-1 Titanium Road Bike
Custom Mosaic RT-1 Titanium Road Bike
Custom Mosaic RT-1 Titanium Road Bike
Custom Mosaic RT-1 Titanium Road Bike


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.

The Mosaic 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. Why? Weight. And ride. Mated to an oversized 44mm headtube that an ENVE Road 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. It's 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. 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.



Ordering Process

  • Tubeset: 3A/2.5V blend of internally butted and thin wall titanium
  • Fork: Enve Road 2.0 1.25" taper
  • Headset: Chris King i8
  • Max Tire Size: 28c               
  • Geometry: Custom or Stock
  • Finish: Choice of Raw Etched and Stainless Head badge  
  • H20 Mounts: Two on down tube, single on seat tube   
  • Front Derailleur Mount: Clamp on / Braze on 
  • Seatpost: 27.2mm, 30.9mm, 31.6mm, ISM / Mosaic titanium topper  
  • Shifting: Mechanical (external routing) Di2, EPS, E Tap (Internal routing   
  • Brake mount: Caliper / Flat Mount Disc
  • Axle: 100 x 12mm Front / 142 x 12mm Rear  Thru / Standard QR                                                                        
  • Brake routing: Internal housing / External  
  • Bottom Bracket: Threaded / English 68mm / PF30 68mm 

Whether you’re already set on a certain make and model of frame, or still have some questions about how to go about your build, drop us a line and we can talk through your options. From the first detail to the final finish, we'll help you dial in the perfect set up for your next dream bike.

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