Crumbworks Chunk Frame and Fork

Out of stock
Available in store: Check availability

Available in store

The hottest all-terrain bicycle of 2024!
Out of stock

We've paid close attention to the Crumbworks Chunk since we visited the shop back in March 2023 and caught a glimpse of Keita's prototype! It's an incredible frame that tastefully mixes old and new standards, has elegant swooping curved tubes, and rides just right. We'll be building one up and putting together a proper review soon, but until then pre-orders are open here.


Handmade in Japan. Made by RIZINWORKS.

  • Tubing: TANGE 4130 Cro-mo mixed up!
  • Head Tube Diameter  1" Threaded
  • Bottom Bracket: 68mm English (BSA) Threaded
  • Fork Spacing: 12x100mm
  • Rear Spacing: 12x142mm
  • Seatpost Diameter: 27.2mm (Stealth dropper post routing)
  • Disc Brake Type: Flat mount for 160mm rotors
  • Maximum Tire Size: 27.5x2.8
  • Chainring Clearance: 42t single
  • 3 sets bottle cage mounts
  • Rear rack and mudguard mounts
  • Full-length cable housing guides for derailleurs and brakes
  • Triple cage mounts fork
  • Stealth Dynamo routing
  • Kickstand plate


  S (47cm) M (50cm) L (54cm)
Top Tube (Effective) 590mm 620mm 660mm
Seat Tube (C-T) 470mm 500mm 540mm
Head Tube Angle 69° 69° 69°
Seat Tube Angle 71° 71° 71°
Head Tube Length 185mm 200mm 230mm
Chainstay Length 470mm 470mm 470mm
BB Drop 50mm 50mm 50mm
Fork Rake 50mm 50mm 50mm
Fork Axle To Crown 410mm 410mm 410mm
Weight 3.05 Kg 3.25Kg 3.45 Kg
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