The perfect all-rounder, our versatile CIRCA frames are hand built in Portland, Oregon and can be set up with a wide range of drivetrain, wheel and cockpit types to form the foundation for a gravel-ready all-road build or a functional and fun city bike. Our modular assembly process gives you infinite flexibility for personalizing your frame with color and component choices, and the precision machined surfaces will turn heads wherever you go.


Each CIRCA frame is hand-crafted in Oregon using locally sourced materials and processes.

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Our build process balances machine precision with fine craftsmanship.


The precision Thru-Axle dropout option is a perfect complement to the clean lines of flat mount hydraulic disc brakes.


The horizontal CIRCA dropout is built for versatility. Our 132.5mm spacing lets you build with almost any drivetrain including derailleurs, single-speeds, internally geared hubs, and even Gates belt drives.


Have a story you want to tell? Our custom laser graphics and design services can make it happen.


Every surface of our precision-machined lugs are thoughtfully considered to balance form, function and process.


Almost everything on our frames is sourced in the USA.


The CIRCA precision CNC’d bottom bracket shows an unyielding attention to matching process, beauty and function.


CIRCA anodized finishes are lighter and tougher than paint, and impervious to the harshest weather. When we design your frame, you can choose where each color is applied, right down to individual lugs.


Our gold anodized option can form the foundation of a head-turning city or town bike.

Please inquire for details for our Short Reach, Long Reach and Full Custom geometries.

Custom Bike Frames


  • Light, durable, smooth-riding 6061 aluminum tubing.
  • Durable, weatherproof anodized finishes stay beautiful with minimal care.
  • Stock or custom geometry available.
  • Stock and custom laser graphics packages available.
  • Can be outfitted to be anything from a Gravel-ready AllRoad to a stealthy belt-drive commuter.
  • Plenty of fender clearance for foul-weather riding.
  • Disc and long-reach brake options available.
  • Versatile design lets you choose your drivetrain type (internal vs. derailleur vs. single speed) as well as your bar type (drop, flat, etc.)
  • Gates Carbon Drive compatible.
  • Sloped top-tube reduces standover height and is comfortable for all genders.

Additional Details:

Seatpost: 31.6mm
Bottom Bracket: 68mm, threaded, standard English
Fork: 1 1/8” threadless or tapered
Dropouts: Thru Axle or QR
QR Rear Dropout Spacing: 132.5mm (allows wide range of drivetrain options)
Thru Axle Rear Spacing: 142mm
Max Tire Widths: 35c for 700c. 38c for 650b.

Get in touch

Leave your name and email below along with what you’re looking for in the message box. You can also call us at 503-780-6082.

Visiting the Studio and Appointments