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Flowbeist attacks groomed single track with confidence thanks to an ultra-aggressive tread that’s ready for whatever the trail throws at it.

  • 4.6” footprint
  • Designed for optimal use as a front tire
  • Aggressive side lugs comprised of soft rubber compound
  • Ideally paired with Dunderbeist rear 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: (upbeat music) Video: A man rides a fat bike quickly through a sunny, wintery, and wooded environment. "45NRTH Flowbeist" text is overlaid as he rides and kicks up snow. Audio: Flowbeist and Dunderbeist are our front and rear specific aggressive fat bike tires. Video: Narrating man stands at a desk with a 45NRTH logo behind him. Audio: They’re best used as a pair, and their high void and deep lug design provides outstanding traction in the snow. Flowbeist is the front specific tire. And since front tires don’t need traction for acceleration, it is designed solely around braking and cornering performance. Video: Rotating Flowbeist tire is in view. Audio: Sharp, paddle style center lugs give ridiculous amounts of grip when grabbing the brakes. Video: View zooms in and “Paddle Center Lugs: For maximum grip.” text is shown to highlight the m-shaped center paddle lugs. Audio: And its tall side lugs provide solid traction when cornering. 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: (slow 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 Flowbeist Fat Bike Tire - black - three quarter view with sidewall and tread detail