URSA Major Single Speed

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CHUMBA Cycles URSA Major single speed Build Specs-01.jpg
URSA Major Features.jpg

URSA Major Single Speed

2,450.00

The URSA Major Single Speed is ready for your chosen grindfest! Our sliding dropouts have the brake mount integrated into the sliding insert make single speed cog and chain adjustments easy.

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Single Speed Model Highlights

  • Hope Fatsno 197x12m x 150x15mm hubset
  • Sun Ringle Mulefut 80SL Tubeless Compatible Rims
  • RaceFace Aeffect Direct Mount Cinch crankset w/narrow wide ring
  • RaceFace cockpit
  • Shimano Deore Hydraulic Brakes
  • Maxxis Mammoth 4.0" 120TPI folding tires with EXO sidewall protection or Maxxis Minion FBF/FBR 4.0" folding tires

Frame Details

  • Made in USA
  • CHUMBA USA Select Steel, ovalized chainstays and oversized tubes, bent downtube gives plenty of room for a Bluto fork in 360 degrees.
  • English threaded 100mm Paragon Machine Works Bottom Bracket. 
  • Oversized 44mm headtube fits tapered forks.
  • Paragon Machine Works stainless steel sliding dropouts
  • 3" - 4.8" Tire compatible, offering one of the shortest steel chainstay lengths out there for both tire sizes, 435mm with a 4.0 tire and 455mm with a 5.0 tire
  • Short chainstays are best for snow riding giving more traction in the snow and more balance. They also happen to be more fun for trail riding on a 26" fatbike.
  • The frame can be used with 190 Quick release hubs or 197 thru axle hubs, depending on the chosen insert. This model comes with a 197x12mm Thru Axle.
  • 2 color options : Sherman Green or Range Blue (TELL US WHAT COLOR YOU'D LIKE IN YOUR ORDER NOTES AT CHECKOUT)

Stock models come with a rigid steel fork. Upgraded fork options include: Rockshox Bluto 100mm or Bluto 80mm and MRP RockSolid Fat Carbon 150mm Fork.

  • When upgrading to suspension, we recommend going for the full 100mm fork option on Medium and Large sizes, 80mm on Small. 
  • We've found the 69 headtube angle to be the best at snow and trail racing, which you'll have with the rigid or an 80mm Bluto. 
  • The 100mm gives a more aggressive trail stance and slacker headtube angle of about 68 degrees when sagged.