GEOMETRY

Frame Highlights

• Tubing: Surly 4130 CroMoly steel frame; main triangle double-butted and ED coated for corrosion resistance.

• Rear Dropouts: Forward-exiting horizontal dropouts with adjusters for single-speed compatibility and wheelbase adjustment (135mm spacing).

• Brake Compatibility: Disc-only setup; supports up to 160mm rotors.

• Braze-ons / Extras:

  • Fender eyelets at dropouts (front & rear)

  • Rack mounts (front & rear)

  • Dual water bottle mounts

  • Downtube shifter mounts

• Seatpost Diameter: 27.2mm

• Seatpost Clamp Diameter: 30.0mm (Surly stainless clamp included)

• Headset / Steerer Tube: EC34/28.6 upper, EC34/30 lower

• Front Derailleur Clamp Diameter: 28.6mm

• Bottom Bracket Shell: 68mm wide, standard English threaded (1.37" x 24T)

• Chainring Clearance: Designed to accommodate a wide range of chainring sizes.

• Tire Clearance: Fits up to 700c x 42mm tires (with fenders) thanks to FFF (Fatties Fit Fine) stays and sloping-crowned fork.

• Fork:

  • 4130 CroMoly steel, disc-only

  • Lugged and brazed construction

  • Sloping crown with threaded eyelets

  • Tapered and butted curved blades

  • Mid-blade rack eyelets and dual dropout eyelets

• Weight:

  • Frame (54cm): 4.74 lb (2.27kg)

  • Fork (uncut): 2.3 lb (1.05kg)

Geometry Overview

(All dimensions in mm; measurements vary slightly by frame size)

• Seat Tube Length (C–T): 520 – 620

• Effective Top Tube Length: 550 – 625

• Head Tube Angle: 72° (all sizes)

• Seat Tube Angle: 73.5° (52cm) → 72° (62cm)

• BB Drop: 72

• Chainstay Length: 425 – 430

• Wheelbase: 1006 – 1071

• Standover Height: 777 – 865

• Head Tube Length: 91 – 185

• Fork Length: 400

• Fork Offset: 44

• Stack: 534 – 628

• Reach: 391 – 421