Chuparosa (Spanish for Hummingbird) is designed to be a versatile trail and all mountain titanium hardtail.   With a quick but stable geometry, it is at home on twisty climbing singletrack or descending a fast rocky trail.   This is the third iteration of this frame design and very different and better by far.

The Chuparosa can use 27.5+  x 3.0 up to 29 x 2.4 wheels and tires.  It could probably run 27.5 non-plus setups with attention to the bottom bracket height.   It’s designed to run 120mm up to 140mm forks and the rear dropout spacing is 148mm boost.  The sliding dropouts mean you can run any Paragon style dropouts, making it easy to adapt to singlespeed or to your axle and hub requirements.

The bottom bracket area has received a lot of attention to make it stiff while the rear triangle maintains that legendary Ti compliance and feel.  The stout 44mm downtube is shaped to reduce flex from pedal inputs and the result is a bike that pedals fast and accelerates into a smooth comfortable ride.

29 x 2.3″ Maxxis Griffin TR

Saddle time has proven the Chuparosa to be a great climber and efficient pedaler.  It’s happy on 29″ tires as a fast trail bike that would give a good account of itself in an XC race.  But it’s sweet spot is on 27.5+ tires with longer travel, running through rocks, roots, and technical singletrack.

27.5 x 3″ Teravail Coronado sand tires. *Photo taken by John Schilling

It’s a bikepacker too, with a front triangle able to accommodate a modest frame bag and a lower downtube bottle mount.  The prototype has bikepacked miles of the Arizona Trail so far in testing, and has proven to be a fun and energy-saving pack mule.

Everybody talks about that one bike, “If I could only have one…”  This might be that one.   It would be for me.

Frame Features

  • Light and beautiful titanium construction
  • Paragon compatible sliding dropouts
  • Boost compatible
  • Fits 27.5+ up to 3.0 tires, and 29″ 2.4 tires
  • Geometry supports 120mm up to 140mm forks
  • 44mm head tube and threaded 73mm bottom bracket
  • 31.6mm dropper seat post compatible
  • Versatile design works for trail, all mountain, XC, or bikepacking.


Geometry Numbers in millimeters
Dimensions are using an unsagged 130mm fork
Standover measured from midpoint between seat tube and head tube

Recommended Rider height
Toptube Effective Length
Seat Tube Length415460508560
Seat Tube Angle73737373
Head Tube Length110
Head Tube Angle68686868
BB Drop50505050
Chainstay Length425425425425
Fork Length540540540540
Fork Offset51515151
Front Center
Standover 791808810810

Prototype Build Specifications

Fork:Rockshox Pike 130mm
Drivetrain:Shimano M8050 XT Di2 11-speed
Brakes:Shimano XT M8000 with Icetech 160mm rear and 180mm front rotors
BB:Raceface 30mm threaded
Crank:Raceface Atlas 30mm Cinch
Chainring:Absolute Black 28T oval Cinch
Wheelset:Light Bicycle carbon AM740 46mm rims, I9 Torch hubs
Tires:MAXXIS Rekon+ 27.5×2.8
Seat:Specialized Phenom
Seatpost:Raceface Turbine
Handlebars:Chromag Fubars
Headset:Cane Creek 40 series

Comments are closed.