Surly Karate Monkey 29" / 27.5+ MTB Frame Chromoly 4130

The Surly Karate Monkey offers a lively and durable ride across all types of rugged terrain. Its versatile frame allows for multiple configurations, adapting to different mountain biking styles. Originally designed as a 29er, the latest version also accommodates 27.5+ wheels, providing more flexibility for riders seeking a personalized experience.

Key Features

• Compatible with dropper posts, 44mm head tube, Gnot-Boost rear spacing, thru-axles, and suspension-corrected fork
• Wide compatibility with most MTB standards (except rim brakes)
• Clearance for up to 29” x 2.5” or 27.5” x 3.0” tires

Technical Specifications

Frame:

• Material: 4130 Chromoly steel, Natch butted tubing, TIG welded, ED coated
• Rear dropout configuration: Horizontal slotted with optional vertical dropout
• Rear spacing:
  • "Gnot-Boost" 145mm
  • Compatible with 12 x 142mm or 12 x 148mm (Surly axle included)
  • Compatible with 10 x 135mm using Surly 10/12 adapter washers (not included)

Fork:

• Material: 4130 Chromoly steel, Natch butted tubing, TIG welded, ED coated
• Front spacing: 15 x 110mm (Surly axle included)

Brakes:

• Rear: Disc – 51mm I.S. (203mm max rotor)
• Front: Disc – 51mm I.S. (203mm max rotor)

Headset:

• Head tube: Ø44mm
• Steerer tube: Ø28.6mm (1-1/8")
• Crown race: Ø30mm (1-1/8")
• Stock headset upper (S.H.I.S): ZS44/28.6
• Stock headset lower (S.H.I.S): EC44/30

Seatpost & Clamps:

• Seatpost diameter: Ø30.9mm
• Seatpost clamp: Ø33.1mm

Drivetrain:

• Front derailleur: High direct mount, top-pull (Ø34.9mm)
• Offset adapter (not included):
  • 26mm for 142mm or 135mm rear hub spacing
  • 29mm for 148mm rear hub spacing
• Max Chainring (CL):
  • 1x (Mtn): 28T
  • 2x (Mtn): 24/34T
  • 1x (Boost): 32T
  • 2x (Boost): 24/36T

Bottom Bracket:

• 73mm threaded (1.37" x 24TPI)

Tire Clearance:

• Frame: Up to 27.5 x 3.0” or 29 x 2.5”
• Rigid fork: Up to 29 x 3.0”

Fork & Suspension:

• Rigid fork spec: 483 x 47mm
• Max suspension fork length: 551 x 51mm (140mm travel for 27.5+)

Mounting Points & Accessories:

• Bottle Mounts:
  • 1 standard + 1 Three-Pack (XS - M)
  • 2 standard + 1 Three-Pack (L - XL)
• Fork Mounts: 2 Three-Pack
• Rack Mounts:
  • Frame: Yes (upper and lower threaded)
  • Fork: Yes (upper, lower, and mid-blade threaded)
• Fender Mounts:
  • Frame: Yes
  • Fork: N/A

Additional Features:

• Internal dropper post routing compatible

The Karate Monkey frame is an excellent choice for riders looking for versatility, durability, and multiple configuration options in a hardtail mountain bike.