URSA 29plus Single Speed


URSA 29plus Single Speed


The URSA Single Speed crushes obstacles and gaps rocks and roots with it incredible roll-over. The build kit is full of reliable performance oriented parts The USA Made PMW Stainless Steel sliding dropouts have the brake mount integrated into the sliding insert make on the fly single speed cog and chain adjustments easy and bombproof.

Component Specs Below, contact us to additionally customize your build : Geometry in Photo Gallery

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URSA 29plus Single Speed Components


  • CHUMBA Frame: URSA 29plus 4130 - Double Butted Chromoly (Made in USA)
  • Rear Axle: Paragon Machine Works Stainless Steel Sliding Dropouts w/148x12 Thru-Axle (Made in USA)
  • Bottle Cage Bolt Set: 5mm Stainless
  • Fork: Surly Steel Fork w/ Rack and Cargo Cage Mounts 110x15 or MRP Rock Solid 490 Fork Carbon 100x15 (upgrade) or Rockshox Pike 100mm (upgrade)


  • Front Brake: Shimano SLX M7000 Hydraulic
  • Rear Brake: Shimano SLX M7000 Hydraulic
  • Front Brake Rotor: Shimano RT66 180
  • Front Brake Adaptor: Shimano 180 PM
  • Rear Brake Rotor: Shimano RT66 180
  • Rear Brake Adaptor: Shimano 180 PM


  • Bottom Bracket: RaceFaceTeam X-Type English Thread BSA 73
  • Crankset: RaceFace Aeffect 170mm-175mm
  • Chainring: RaceFace 32T NW
  • Cog: Wolf Tooth Components 20T 
  • Chain:  PC-1 Silver
  • Cassette Spacer Kit: Wheels Mfg. Black Spacer Kit


  • Headset: Cane Creek 40 Series ZS44/EC44 Tapered
  • Headset Spacers:  Cane Creek Alloy
  • Handlebar: RaceFace Evolve 31.8x740mm ,10mm rise, Black 
  • Stem: RaceFace Evolve 31.8x70-120mm
  • Grips: RaceFace Love Handle Black Lock-on
  • Saddle: WTB Volt Pro Black
  • Seatpost: RaceFace Ride XC 31.6x400mm


  • Front Wheel: Stans Baron 29plus 110x15, Boost, comes tubeless installed
  • Rear Wheel: Stans Baron 29plus 148x12, Boost, comes tubeless installed
  • Front Tire: WTB Ranger TCS 29x3.0"
  • Rear Tire: WTB Ranger TCS 29x3.0"


  • Oversized 44mm Head tube for tapered or straight steerer tubes
  • 73mm Bottom Bracket
  • ISCG-05 for skid plates
  • 31.6 Seatpost Size
  • CHUMBA Custom half yoke chainstay and bridges
  • Room for 4 bottles on all sizes!
  • Mounts for Cargo Cages
  • Rear Rack Mounts
  • 148 x 12 Boost Thru-Axle Rear
  • Stainless Steel Sliding Dropouts