Diablo Hardtail Frame Package
Diablo Hardtail Frame Package
Standard finishes are included. Custom 1-Color adds $250; Custom 2-Color adds $400.
Premium / Complex Paint — Contact us for a quote · Explore paint options
Built to order
Your Cobalt is prepared for you. Timing varies with frame availability, paint, and component selection. Contact us for a current delivery estimate.
A light carbon hardtail built for XC speed, trail capability and big-volume tires.
The Cobalt Diablo is a 100% Toray carbon hardtail platform designed around modern 1× drivetrains. At approximately 1,050 g for the frame, it combines a light chassis with SRAM UDH/T-Type compatibility, Boost rear spacing and clearance for high-volume tires.
Who It’s For
Choose the Diablo if you want hardtail efficiency and simplicity for XC riding, racing and fast trails, with enough tire clearance to build it toward a more capable trail setup.
Frame Specifications
| Frame | 100% Toray carbon fiber |
| Sizes | 15.5 / 17.5 / 19 / 21 |
| Frame Weight | Approx. 1,050 g |
| Tire Compatibility | 29×2.6 / 27.5×2.8 |
| Derailleur | SRAM UDH / T-Type compatible |
| Rear Axle | 12×148 Boost |
| Bottom Bracket | BSA threaded, 73 mm |
| Seatpost | 30.9 mm |
| Drivetrain | 1× platform |
Geometry & sizing
| Size | Seat tube (mm) | Seat angle (°) | Effective top tube (mm) | Head tube (mm) | Head angle (°) | Fork length (mm) | Fork offset (mm) | Wheelbase (mm) | Front center (mm) | Chainstay (mm) | BB drop (mm) | Stack (mm) | Reach (mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15.5 | 395 | 75 | 575 | 95 | 69 | 506 | 51 | 1102.3 | 679.2 | 430 | 60 | 603.7 | 410.6 |
| 17.5 | 440 | 75 | 600 | 100 | 69 | 506 | 51 | 1127.7 | 704.5 | 430 | 60 | 608.3 | 437 |
| 19 | 480 | 75 | 625 | 115 | 69 | 506 | 51 | 1154 | 730.7 | 430 | 60 | 622.3 | 457.8 |
| 21 | 520 | 75 | 650 | 125 | 69 | 506 | 51 | 1179.7 | 756.3 | 430 | 60 | 631.7 | 480 |
Diablo or Hellbender?
Choose the Diablo for hardtail simplicity, low weight and direct XC efficiency. Choose the Hellbender when full-suspension control and 100–120 mm rear travel better fit your terrain.
Built Around You
The Diablo can be configured for fast XC riding or a more trail-oriented build. Contact Cobalt with your height, inseam, terrain and riding goals for sizing, fork and complete-build guidance.
Build Ride Inspire