URSA Major Frame

ursa frame colors full.jpg
URSA Major Geo.png
URSA Major Features.jpg
CHUMBA-Decal-Options.jpg
ursa frame colors full.jpg
URSA Major Geo.png
URSA Major Features.jpg
CHUMBA-Decal-Options.jpg

URSA Major Frame

from 1,250.00

The URSA Major sets a new standard for steel fatbikes with its ultra short chainstays, 197x12 thru axle stainless sliding dropouts, class leading standover clearance, and 100mm suspension fork compatibility. 

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We've lowered the top tube on all sizes to give the best in class standover height. When you standover your bike in the snow you'll thank us.

Specs

  • Oversized 44mm headtube fits tapered forks and straight steer forks
  • Headset ZS44 Upper / EC44 Lower
  • Designed for use with 100mm Suspension or Rigid 483mm - 490mm forks
  • 31.6mm Seatpost and 34.9 Seatpost clamp
  • English threaded 100mm Paragon Machine Works bottom bracket 
  • Paragon Machine Works stainless steel sliding dropouts, can be used geared, singlespeed or Rohloff

Frame Details

  • Made in USA
  • CHUMBA USA Select Steel:  Custom Oversized double butted 4130 Chromoly tubes 
  • Downtube has plenty of room for a Bluto fork in 360 degrees of rotation
  • 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 4.8" tire
  • The frame can be used with 190 Quick release hubs or 197 thru axle hubs, depending on the chosen insert
  • 3 bottle mounts on sizes Large and XL, 2 Bottles on sizes small and med
  • 2 color options : Sherman Green or Range Blue
  • You can select your dropout insert and downtube decal when you "add to cart"