Home > Bike Types > Fatbike

Groomed singletrack gets its own fat bike tires with new 45NRTH FlowBeist & Dunderbeist

19
Support us! Bikerumor may earn a small commission from affiliate links in this article. Learn More

 

Flowbeist_TR4563-04

Earlier this week, 45NRTH already let the cat out of the bag for Groomedsingletrack.com. So what’s better than riding groomed singletrack? Riding groomed singletrack on purpose built tires from 45NRTH. That’s right, the new Flowbeist and Dunderbeist are specifically designed for riding on groomed fat bike trails. That may seem like a bit of a stretch, but there are a number of design features that will make these front and rear specific tires perfectly suited to ripping the velcro ribbons.

Find out what makes a groomed singletrack specific tire after the break…

Flowbeist_TR4563

Dunderbeist_TR4561

If you ask 45NRTH, they view groomed singletrack fat bike trails as the future of Winter cycling. But just like how different environments ask different things of your mountain bike’s tires, groomed trails have their own requirements and needs for optimal performance – namely traction, cornering, and braking control on packed trails. Divided into the front specific Flowbeist and the rear Dunderbeist, the 4.6″ tires are tailored to offer the most floatation but without the weight penalty of most larger tires.

Even though the tires are designed specifically, 45NRTH points out that they will excel in any situation with loose snow. Perhaps a “shredding” snow tire makes more sense as a category, than a groomed singletrack tire, but you get the idea. These tires are meant for aggressive riding on snow.

dunder

Instead of going with a full 4.8″ tire, 45NRTH settled on a 4.6″ tread width which offers more floatation than a 4″ tire, but still offers a lower profile. An added bonus is that the 4.6″ tire will fit in many frames that lack the room for full 4.8″ rubber. In order to grip better on snow, the tires use a dual durometer construction with 60a rubber in the middle of the tread and softer 52a on the sides.

Flowbeist_TR4563-03 Dunderbeist_TR4561-01

On the front, the Flowbeist features a chamfered leading edge to keep rolling resistance at a minimum. The center tread also offers plenty of perpendicular edges for confident braking on loose snow. To keep cornering in check, the shoulders are armed with 8.3mm lugs that are reinforced and have hollow centers for improved grip when leaning. Out back, the Dunderbeist has more perpendicular edges for digging in on braking and acceleration, along with center cavities to add edges and create better grip. The more edges the better, so the lateral grooves on the shoulder knobs serve the same function. The rear lugs use two different designs for better cornering with 7.4mm side lugs with fore-aft grooves and 7.8mm shoulder lugs and hollow centers for improved stability.

Flowbeist_TR4563-02 Dunderbeist_TR4561-02

Weights are claimed to be around 1350-1375g for the Flowbeist, and 1500-1575g for the Dunderbeist. Sold in a 120 tpi tubeless ready casing, both tires will start with limited availability in April 2015.

 

Subscribe
Notify of
guest

This site uses Akismet to reduce spam. Learn how your comment data is processed.

19 Comments
Oldest
Newest Most Voted
Inline Feedbacks
View all comments
Sevo
Sevo
7 years ago

Beautiful set of tires.

mudrock
mudrock
7 years ago

Bikes, even fat bikes, don’t work in the winter in deep snow. They are worse than skis, which have floatation because of their length, or snow shoes, which have a much larger contact patch. Give it up. Feel free to comment.

scott
scott
7 years ago

mudrock,

Where in the story did it mention anything bout trying to ride in deep snow? These tires are stated to be purpose built for groomed singletrack. Something I have access to at a half dozen trails in my area during the winter.

Take it up. Feel free to comment.

Gunnstein
Gunnstein
7 years ago

@mudrock: True, for a given definition of “deep snow”, “ski” and “don’t work”. For other definitions fatbikes are fantastic. That’s about as far as this discussion will get, I expect.

Everything is true, for a given definition of “true” – Terry Pratchett

Randall
Randall
7 years ago

@mudrock: Fat bike tire will have as big a contact patch as a sled dog snowskates… Both work on groomed trail, both [i believe] wouldn’t work in deep powder.

http://sleddogs.com/

The question I’d have is why the soft rubber on the sides, I get trying to grip trails that have rocks/roots/ things that are generally harder than any rubber, but I’d think the easiest way to get grip on hard-pack snow would be with hard spike-like tread…

Frank
Frank
7 years ago

On the one hand, to me ‘groomed’ trails means firm and packed, Husker Du territory, so these do not seem like the tire for that

On the other hand these tires look GREAT for general snow riding. Finally a rear tire tread that’s just big paddles. BIG side knobs on the front tire designed for steering. Yes! Just wish they had a studded option. Trails get packed and become icy after a while.

Ski’s are ideal for the days after a snow storm when the snow is still deep and fluffy. Fat bikes are for a week later when its packed down, and the ski trails are icy.

Gunnstein
Gunnstein
7 years ago

Those mixed up Germanic/Scandinavian names – a gimmick, or do they actually speak that way up at 45NRTH? 😉

Beist = big animal, monster
Husker Du = do you remember? (the heavy metal umlauts is their invention)
Wolvhammer, Sturmfist: I guess you get these. Got a nice Castle Wolfenstein vibe to them.

bigdaddy
bigdaddy
7 years ago

I have to assume comments about fat bikes and “deep snow” must be made by people who don’t ride fatbikes or don’t have the legs to give it a go. My cross bike goes through snow better than any other bike I own. it doesn’t turn for crap nor will it climb but the skinny tires cut through snow better than anything with far less resistance. that is why I ride a fat bike. to turn, climb, and get in extra days in the saddle rather than stay stuck inside. It is a supplement not a staple. Why skip a riding day if you don’t have to. Nobody is out riding 36″ of fresh powder so what are we talking about every time deep snow comes up. I have lights charging, coffee brewing, and snow falling. I’m waiting for 10″+ just for kicks. I’m hoping for first tracks. We’re close. So murdock, what is deep snow? Trying to ride 36″ of fresh powder would be pretty dumb but we’d be dumb to assume anyone is trying to ride ski conditions. In my opinion you get what you give. you can ride in two feet earn every bit of the ride. I’d rather man up and do that than sit on a trainer and lose the extra riding days. I say toughen up and give it a go until it is really impossible. Murdock is more than welcome to come ride in my tracks so the snow isn’t so deep.

Xris
Xris
7 years ago

The names of the 45nrth products are names of deathmetal bands. Norwegian, Swedish, etc. Look it up. You learn something every day!

Kark
Kark
7 years ago

ah Xris, you don’t really consider Dillinger four a ‘death metal’ band do you? even weirder would be lumping Husker Du in that genre.

PTymn Wolfe
PTymn Wolfe
7 years ago

@Xris…..you should learn something about Metal yourself before commenting and telling others to learn. Look it up! Try harder next time.

ascar larkinyar
ascar larkinyar
7 years ago

if the snow is groomed just ride your 29er….no snow bike needed

Jeff
Jeff
7 years ago

Dillinger… I was thinking more of the Drum n Bass/Jungle producer than escape plan. Then I noticed that he is actually known as Dillinja https://www.youtube.com/watch?v=BI6U8F8KDIE enjoy

Bud and Lou has some competition. These will be great in anything that has a base with a powder surface, or trail that’s going a bit soft, or has been shredded. Something grippy for those corners that have been turned to ice after 200+ tires have smoothed them out.

Jeff
Jeff
7 years ago

Part two is even better imo https://www.youtube.com/watch?v=j7i6iSH19rA

gringo
gringo
7 years ago

The guy who designed the Minion back in the day must be flattered that his intermediate knobs keep showing up on all brands new tires.

King County
King County
7 years ago

Ascar said what I was thinking. As long as they trails are groomed, groom them enough that we can just ride our regular mtbs and not have to buy a fat bike. Surly put on a race a while back. If you won on one of their bikes you were in the money. A guy won on a regular 29er.

AlanM
AlanM
7 years ago

For those saying just ride a regular 29er on groomed trails, many of the groomed trails have a minimum tire width to prevent the groomed snow from being torn up.

Chach
Chach
7 years ago

Groomed doesn’t always mean hard packed.

Jeff
Jeff
7 years ago

I’d like to see a true 4″ to 4.2″ from these guys. I’ll never go larger than 85mm rim

Subscribe Now

Sign up to receive BikeRumor content direct to your inbox.

Subscribe Now

Sign up to receive BikeRumor content direct to your inbox.