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So far it’s a solo ride.

Custom Mosaic GT-1 Titanium Gravel Bike

Custom Mosaic GT-1 Titanium Gravel Bike

The Custom Mosaic GT-1 Titanium Gravel Bike

Builds starting from $7700

Custom, handbuilt frames were the original "gravel" bikes, built around bigger tire clearance but with road-going geometry. The Mosaic GT-1 is the natural successor to these original all-surface machines. 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 GT-1 Titanium Gravel Bike
Custom Mosaic GT-1 Titanium Gravel Bike
Custom Mosaic GT-1 Titanium Gravel Bike
Custom Mosaic GT-1 Titanium Gravel Bike


The Mosaic GT-1 is a true standout from the field with custom front triangle butting, internal brake routing, a myriad of finish options, and ENVE's relatively new GRD carbon fork. The GRD is revelatory for the GT-1, giving a much lower ride height versus a comparable cyclocross fork. The result is a front end that's easy to get on top of for technical road descending and quicker handling.

Built around 12mm thru-axles, the Mosaic GT-1 is as stiff as it is flexible, and the indefatigable titanium construction defies both the elements and mishaps. The GT-1 is based on Mosaic’s road-going RT-1, using the same rider-specific custom-butted titanium top and downtubes, and smaller diameter S-bend seatstays for comfort during marathon events like the Belgian Waffle Ride and Dirty Kanza.

Winter bike? Gravel racer? Bikepacking? With Mosaic, the possibilities are indeed endless, with a litany of frame options, from fender/rack mounts, pump pegs, and bespoke paintwork. Internal brake/shift routing is standard, and a 44mm oversized headtube makes room for the GRD's tapered steerer. All of Mosaic's raw ti finish options are available at no charge, and custom paint is also an option. Every Mosaic GT-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

  • Geometry: Custom / Stock
  • Tubeset: 3A/2.5V blend of internally butted and thin wall titanium
  • Fork: Enve GRD 1.25" taper
  • Headset: Chris King i8
  • Brake mount: Flat Mount Disc
  • Brake routing: Internal housing
  • Axle: 12mm Front, 142 x 12mm Rear
  • H20 Mounts: Down tube and seat tube
  • Max Tire Size: 38c (up to 40mm for the IAR)
  • Editions: GT-1 AR, GT-1 45, GT-1 X, GT-1 IAR
  • Geometry: Custom or Stock
  • Finish: Choice of Raw Etched and Stainless Head badge  
  • Third H20 Mount: 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  
  • Front Derailleur Mount: Clamp on / Braze on 
  • Shifting: Mechanical (external routing) Di2, EPS, E Tap (Internal routing )
  • 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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AC Advice

The GT-1 (IAR) is at home on an impressive variety of terrain. I've taken it countless trips over the last twelve months, smashed endless intervals, and set it up in multiple wild configurations. From the twisty, tarmac switchbacks of the Dolomites, to the rugged, loose gravel at Crusher in the Tushar in Utah, to fully fendered winter training rides through NorCal's atmospheric rivers, my GT-1 IAR has been my most consistent and reliable training partner

Brennan Wertz - Pro Gravel Racer