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 and cockpit types to form the foundation for a fast-and-light road bike 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-built to your specifications in Portland, Oregon.


The horizontal CIRCA dropouts are 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 with your frame? Our laser-etching services allow full graphic storytelling.


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


Our aluminum tubing and billet, CNC'd lugs, finishes and final assembly are all produced in the U.S.A.


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


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


CIRCA anodized finishes are lighter and tougher than paint, and impervious to the harshest weather.


Color is a great way to give your bike personality. In a CIRCA design session, you can pick from a fun palette of durable anodized finishes and get creative with how colors are applied to different parts of the frame to create a bike that's distinctly yours.


Please refer to this guide for sizing assistance. If you're in-between sizes, don't fit the current size range, or require something different, please contact us about custom geometry options.


Custom Bike Frames



  • Light, smooth-riding 6061 aluminum tubing.
  • Durable anodized finish stays beautiful with minimal care.
  • Stock and custom laser graphics packages available.
  • Can be outfitted to be anything from a stealthy daily commuter to a Cycle Oregon-ready high-mileage workhorse.
  • Plenty of fender clearance for foul-weather riding.
  • Long-reach brake or disc 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 tends to be more comfortable for female riders.


Additional Details:

Seatpost: 31.6mm
Bottom Bracket: 68mm, threaded, standard English
Headset: 1 1/8″ threadless
Fork: 1 1/8” threadless
Rear Dropout Spacing: 132.5mm (allows wide range of drivetrain options)

Pricing: Frames starting at $1,995.00 (August 2017)

Out of Town? If you can’t make it to Portland for a design session but would love to have your own CIRCA, just send us a note using the contact tool on the right edge of the page to get the conversation started.

Want to Design Your Own CIRCA? Excited? Curious? Want to learn more? Get started by sending us a note using the contact tool on the right edge of the screen. From there, we can book an appointment for an informational meeting, design session, or phone call.