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Let Dunderbeist loose on your local groomed single track and feel the aggressive tread claw through the snow with unrivaled propulsion and braking traction. Its 4.6” footprint provides enhanced flotation and is compatible with a wide range of frames. Dual compound rubber rolls fast and keeps you in control while shredding the berms. Point uphill and feel the Dunderbeist dig in as you attack climbs covered in loose, unconsolidated snow. Pair Dunderbeist with its sibling front tire, Flowbeist, for the ultimate combination of traction and control.

  • 4.6” footprint
  • Designed for optimal use as a rear tire
  • Aggressive side lugs comprised of soft rubber compound
  • Ideally paired with Flowbeist front tire
26 X 4.6" (559/26" MTN)
View Tire Geometry Chart
120tpi Ultralight
Folding Tubeless Ready
65–102mm wide rims

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Audio: (dramatic music) Video: A man rides a fat bike quickly through a sunny, wintery, and wooded environment. "45NRTH Dunderbeist" text is overlaid as he rides and kicks up snow. Audio: Flowbeist and Dunderbeist are front and rear specific, aggressive, fat bike tires. They’re best used as a pair and their high void and deep lug design provides outstanding traction in the snow. Video: Narrating man stands at a desk with a 45NRTH logo behind him. Audio: Dunderbeist is the rear specific tire, and it’s designed around accelerating, braking, and cornering. Video: Rotating Dunderbeist tire is in view. Audio: Tall lugs that face forward give forward bite, and dig into loose snow as you accelerate. Video: View zooms in and “Tall Lugs: Dig into loose snow.” text is shown to highlight tall center lugs that face forward with a slight ramp. Audio: Backward facing lugs, give the rider grip when braking. Video: “Backward Facing Lugs: Grip when braking.” text is shown to highlight the backward facing side of the same tall center lugs. Audio: The tall side lugs keep the rear of the bike planted through corners. Video: “Tall Side Lugs: Provide traction when cornering.” text is shown alongside a highlighted raised side lug near the edge of the tread. Audio: Both the Flowbeist and Dunderbeist, use a dual compound rubber with softer rubber on the sides, for more grip when cornering. Video: “Dual Compound Rubber: More grip when cornering.” text is shown to highlight the side lug material. Audio: We offer Flowbeist and Dunderbeist in these sizes. Video: View zooms out and “26 x 4.6”: 120TPI Folding Bead” text is shown for sizing. Audio: (dramatic music) Video: 45NRTH logo and “” text is shown, along with Instagram, Facebook, and Twitter logos.


  • Acceleration Traction
  • Braking Traction
  • Cornering Traction
  • Rolling Efficiency
  • Flotation
45NRTH Dunderbeist Fat Bike Tire - black - three quarter view with sidewall and tread detail