Surly Karate Monkey frame set, black

...is more than just a frame – it’s the foundation for your next adventure. Whether it’s singletrack, gravel tracks or long-distance rides: this frameset will take you anywhere.

Sizes: M, L, XL

Colour: Hi-Viz Black

The Surly Karate Monkey is a versatile steel hardtail frameset, perfect for trail riding, bikepacking and custom MTB builds.

Specifications:

• Frame material: 4130 chromoly steel, double-butted, TIG-welded, ED-coated

• Fork: Chromoly rigid fork, 483 mm length, 47 mm offset

• Suspension fork compatibility: Up to 140 mm travel (27.5+)

• Wheel sizes: 27.5" × 3.0" or 29" × 2.5"

• Axles:

• Front: 15 × 110 mm Boost

• Rear: ‘Gnot-Boost’ 145 mm – compatible with 12 × 142 mm & 12 × 148 mm

• Brake mount: Disc brake, IS 51 mm (max. 203 mm rotor)

• Bottom bracket: BSA 73 mm (1.37" × 24 TPI)

• Seatpost: Ø30.9 mm, dropper-compatible

• Headset: ZS44/28.6 top, EC44/30 bottom

🚴‍♂️ Versatility for your setup

• Compatible with in-hub gears and in-hub dynamos (e.g. SON or Shimano)

• Mounting points for bottle cages, luggage racks and bikepacking accessories

• Chainring options: 1x or 2x MTB & Boost configurations

• Front derailleur mount: High Direct Mount, Ø34.9 mm

🌄 Suitable for

• Trail & All-Mountain

• Bikepacking & off-road touring

• Custom MTB build with steel frame

• Commuting with hub dynamo and lighting system

• Designed for wheel sizes:

• 27.5" × 3.0"

• Maximum tyre diameter: 29" × 2.5"

(Tyre clearance depends on rim and drivetrain configuration)

• Frame material:

• 4130 chromoly, double-butted main triangle

• TIG-welded, ED-coated

• Fork:

• Rigid fork: 483 mm length, 47 mm offset

• Max. suspension fork: 551 × 51 mm (140 mm travel on 27.5+)

• Axles & mounting dimensions:

• Front: 15 × 110 mm (including Surly axle)

• Rear: ‘Gnot-Boost’ 145 mm – compatible with 12 × 142 mm & 12 × 148 mm

• Brake mount:

• Disc brake, 51 mm I.S. (max. 203 mm rotor)

• Headset:

• Top: ZS44/28.6

• Bottom: EC44/30

• Bottom bracket:

• BSA 73 mm (1.37" × 24 TPI)

• Seatpost & clamp:

• Ø30.9 mm seatpost, Ø33.1 mm clamp

• Dropper post compatible

• Front derailleur:

• High Direct Mount, top-pull (Ø34.9 mm)

• Offset adaptor for different hub spacings (not included)

• Chainring compatibility:

• 1x (Mtn): up to 28T

• 2x (Mtn): up to 24/34T

• 1x (Boost): up to 32T

• 2x (Boost): up to 24/36T

• Mounting points:

• Bottle cages: 1 standard + 1 Three-Pack (XS–M), 2 standard + 1 Three-Pack (L–XL)

• Fork: 2 Three-Pack mounts

• Rear mudguard mount provided