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  • 45NRTH - Dunderbeist Tubeless Fat Bike Tire - Black 120 Tpi
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  • 45NRTH - Dunderbeist Tubeless Fat Bike Tire - Black 120 Tpi

45NRTH Dunderbeist Tubeless Fat Bike Tire


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    • Black 120 Tpi, 26x4.6

    5 Reviews


    Snow beast.

    Attack snowy fields and mountains filled with beautifully groomed corduroy on the 45NRTH Dunderbeist Tubeless Fat Bike Tire. Billed as a rear-specific tire, the Dunderbeist boasts beefy knobs with wide spacing to dig in on the climbs and hook up in the corners for confident control. Dual compound rubber provides a dose of extra gripping power and durability to last many a winter mile, and its tubeless-ready bead lets you choose between tube-free and traditional clincher setups. The Dunderbeist is designed to pair with the front-specific Flowbeist tire and rims ranging from 65 to 102mm wide.

    • Item #NRH0004

    Tech Specs

    dual compound rubber
    26 x 4.6 in
    clincher, tubeless
    Recommended Use
    snow and sand
    Manufacturer Warranty
    1 year limited

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

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    Avoid these til they fix flimsy sidewall

    • Familiarity: I've put it through the wringer

    These tire’s sidewalls are horrible. They’ll withstand one tubeless mounting. Next season, forget about tubeless, as you’ll see things like:
    Bead separation from sidewall
    Holes in the sidewall
    Deteriorated sidewall

    A tire this expensive should survive more than one tubeless mount; more than one season - especially if they’re only used in snow.

    I think 4tnrth must know about these issues & are quietly shipping newer, more robust versions of this tire as old, bad inventory gets depleted. How do I know? I’m on my third flowbiest, and it is noticeably different (in durable/good way) than the first two.


    • Familiarity: I've used it several times

    Riding these with tubes as my rims won't run tubless. Compared to my previous tires, Kenda Juggernaut's, these grip like nails, uphill and down. I've not had any of the sidewall issues the others mention here, but only have about 8 rides so far so will update if I have others.

    Pros:Grip, ability to go tubeless

    Cons: Pricey

    Less than 500 miles

    • Familiarity: I've used it several times

    Came home from a easy 18 mile ride in the snow today and to my dismay the fricken sidewall was torn right off the bead in two spots and tube bulging out!!!! Good thing I made it back!! Do not buy this garbage! Waiting on 45nrth's response and refund!

    Great tread, pitiful side wall

    • Familiarity: I've used it several times

    I'm very disappointed with my Dunderbiest. I've had it on my bike for 3 to 4 weeks, and already the casing closest to the rim has become ragged & porous. It now won't hold the air in a Tubeless configuration, as is advertised by 45nrth. Does 45nrth stand behind their products in any way? This is my first time using their tire - possibly my last.