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Borealis Bikes Yampa X0/X9 Complete Bike

$2,299.00 $3,599.00 36% off

Item # BOR0001

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  • Black/Red, S ($2,299.00)
  • Black/Red, M ($2,299.00)
  • Black/Red, L ($2,299.00)
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Item # BOR0001

Lightweight fattie.

This is what fat bike enthusiasts the world over have been waiting for. The team at Borealis drew from years of experience at the bleeding edge of fat bike development with the express purpose of making the Yampa X0/X9 complete bike the best possible tool for the job. You see, these guys have been riding fat bikes since it involved welding together pairs of standard width rims, so they've seen fat bikes develop from their infancy. Borealis adopted new standards for components and construction in hopes that it could deliver a product that improved on the competition in every measurable way. With builds coming in well under 30 pounds, we'd have to say that they've hit their mark. And it's not just the light weight that makes the Yampa so drool-worthy. With its proven SRAM drivetrain and Surly rims and tires, it's downright bulletproof too. If you view your fat bike as essential, and not a mere novelty, consider this your dream ride.

Borealis built the Yampa frame using the most up to date carbon fiber construction methods. Beyond shedding grams, the composite construction has enabled Borealis to finely tune the flex and build a strong frame that will hold up to year 'round use. The profiling of the seatstays in particular enables added vertical compliance, while the oversized chainstays keep the pedaling responsive when you stomp on the gas. Tire clearance was paramount, and accordingly, the Yampa clears massive 4.8 inch tires on a 100mm wide rim. To achieve that degree of clearance without resorting to a weaker offset wheel, the Yampa uses a Borealis 197mm spaced rear hub. The result is a dishless rear wheel, perfect drivetrain alignment with the 100mm threaded bottom bracket shell, and more than enough clearance for the drivetrain regardless of your tire choice. Naturally, there's plenty of extra clearance for mud, snow, or anything else you're likely to find yourself riding through. The head tube is a tapered affair, which yields incredible stiffness when paired with Borealis's thru-axle equipped carbon fiber fork. It's equipped with three bottle cage mounts, to keep you hydrated for long hours in the saddle. And at 1270 grams for a medium frame, this just may be the lightest fat bike frame in existence.

SRAM's X9 drivetrain got the nod for the Yampa's build, and it's capped off with an X0 rear derailleur. The crankset is a Race Face Ride setup, with 22/36t double chainrings for a wide gearing range. SRAM's BB7 mechanical disc brakes brakes handle stopping duties, and the cockpit is primarily Truvative hardware with a WTB saddle. The wheels are Borealis's own hubset, featuring a 197mm thru rear and a 135mm 15 QR thru-axle front hub. They're laced with stainless spokes to Surly Turnagain rims, wrapped in 3.8 inch Surly Knards tires. Think of it as a no-worries setup for extended adventures.

The Borealis Yampa X0/X9 complete bike is available in four sizes, from small to extra-large, and in the colors Black/white, and Black/red.

Read Our Review

  • Full carbon frame
  • Full carbon fork
  • Three water bottle cage mounts
  • 197mm rear spacing
  • 135mm front spacing with 15mm thru-axle
  • SRAM drivetrain
  • Surly rims and tires laced to Borealis hubs
  • Clearance for 4.8in tires on 100mm rims

Tech Specs

Frame Material:
carbon fiber
Borealis FF1
Front Derailleur:
SRAM X.9 (double)
Rear Derailleur:
22 / 36 t Race Face Ride
Bottom Bracket:
100mm BB shell
SRAM PG-1070
SRAM PC-1051
160 mm Avid
TruVativ Stylo T20
TruVativ Stylo T20
WTB Rocket V
TruVativ Stylo T20
Seat Collar:
Front Axle:
15mm thru-axle
Rear Axle:
197mm thru-axle
Surly Knards
Tire Size:
3.8 in
Recommended Use:
sand, snow
Actual Weight:
Black/Red, L: 13,390g

Geometry chart


Geometry Chart



Seat Tube


Effective Top Tube


Head Tube


Head Tube Angle


Seat Tube Angle


Bottom Bracket Drop




S 15.0in 23.0in 4.3in 69.8o 73.0o 2.4in 18.2in
M 17.0in 23.8in 5.1in 69.8o 73.0o 2.4in 18.2in
L 19.1in 24.6in 5.9in 69.8o 73.0o 2.4in 18.2in
XL 21.0in 25.3in 6.5in 69.8o 73.0o 2.4in 18.2in

Reviews & Community

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Here's what others have to say...

can you add after market front suspension forks?

Responded on

That is a great question. Unfortunately, this Yampa frame cannot run a suspension fork .

If you have any questions if this bike is right for you, I will be happy to help you out. I am usually in the office Monday/Tuesday/Thursday/Friday 11:30am-9:30pm you can request me by phone (1.888.276.7130 ext. 4646) during those hours. You can also send me an email @ at any time.

5 5

First fat bike

  • Familiarity: I've used it once or twice and have initial impressions

Received my yampa a few days ago. Everything was packaged very well and I was able to put it together quickly and everything was already adjusted perfectly. Mainly bought it for winter riding but took it out on some dry single track today and was surprised how much grip I had on downhills. The bike just eats up roots and rocks and spits em out. Also climbs like a goat. I am definitely hooked and will be riding it more than just in the winter. It's a great bike especially at the lower price. The only downside is the heavy 27 tpi knards that come with the bike. Swapped them out for some panaracer fat b nimbles and took over 2 lbs out of the bike.

Does the black/white Yampa that is currently on sale comes with black or red rims? Thanks!

Best Answer Responded on

The Black/White bike actually has blue wheels. We have one remaining with black wheels. PLease call me directly @ 801-736-6396 x4378, or e-mail to specify the variant you would like.

RED RIMS shipped with the Yampa.

Here is a picture of the Red Rims you get with the Black/Red Yampa. You do NOT get the standard black rims as shown in the pictures. Buyer beware.

RED RIMS shipped with the Yampa.
2 5

BRIGHT RED RIMS - Without a Warning.

  • Gender: Male
  • Familiarity: I returned this product before using it

I received my Borealis Yampa on Friday 6/19/2015. I was very excited to receive it as I had spoken to the Customer Service Reps at Competitive Cycle many times and confirmed the color, size, etc.

HOWEVER, when I received the bike, I was shocked to find-out that it came with BRIGHT RED RIMS. I even asked the Customer Service Rep twice about the color scheme before ordering because I had read some bad reviews on Yelp concerning other products.

Needless to say, I called CC right away and was told that Borealis is shipping all the Yampa's with these bright red rims now. They said they sent-out an e-mail informing everyone, but my bike had already been shipped.

The bike seems like a nice ride, but I am 47 now and the red rims are just to much bling for me.

The Customer Service Rep said he would take care of me and would "make it right". However, the only option I was given was to send the bike back for a refund.

Nothing like wasting MY TIME for their MISTAKE. So now I have to box it back up and send it back. What a pain. Things like size and color matter...especially when the bike is almost $2,400. For $2,400 I expect to receive what I ORDERED.

I would beware of CC as they do not have their act together. You would think that someone would have noticed the bright red rims were not stock while they were "building" the bike...but I guess that is too much to ask.

If you want a bike with lots of bling, then I suggest the bright red rims. However, if you want something more subdued, then I would suggest calling them directly before ordering to find-out what you are getting for your money.

Responded on

Did you order the black with red or black with white bike? I wonder if the black with white also comes with red rims? Judging from Jeremy S.'s picture below, it appears black w/white has black rims and no bling.

Responded on

I ordered Black with Red. I asked if they could just exchange the red rims for the correct black ones and they said they did not have any black rims to send me. So I do not know what you will receive if you order the Black with White color. They just told me the Yampas are coming with red rims now. I guess Borealis must have had an overstock of red rims and they thought no one would notice. Anyway you cut it, I'm not a happy customer.

4 5

First fat bike and now I am hooked!

  • Familiarity: I've used it once or twice and have initial impressions

So I had not bought a new bike since my 1993 Gary Fisher MTB (decided motorcycles and snowmobiles were a better investment at the time), so fast forward to today and I have now had my Yampa X0/X9 for 10 days (keep that in mind when you read my feedback as I likely have no clue what I am talking about).

After getting it setup I took it for a couple quick loops on the paved and very mild trails around the house and overall seemed fine. Then today I did a 10 mile ride which was a combination of mud, hard pack, 4' tall prairie grass (sucked), and more water crossings than I can a word the bike did AWESOME! I was blown away at how well it allowed me to point at just about anything and GO! For a non-front suspended hardtail I thought it rode great and now want to try the Borealis Echo just for comparisons (Bluto). I cannot wait until the trails are covered in snow to update this review but very early dirt trail impressions are positive. My only gripe is the brakes...likely going to switch to some hydro's, not sure which ones yet and the Turnagain rims are supposedly a pain, if not impossible, to turn tubeless...haven't tried just yet but will deal with that in the fall.

Overall, got a great deal on the bike, like it a lot so far and would certainly purchase it again based on early impressions.

First fat bike and now I am hooked!

What model year is this bike? Could I mount a RockShox Bluto on it?
Could you provide more details on the hubs, which model?
How much assembly is needed?

Responded on

If you are planning on ordering one of the Yampa's that are currently on sale, I would strongly suggest that you read my post concerning the Bright Red Rims that they switched to without telling anyone. They still have not updated their website to mention the substitution. So buyer beware.

5 5

Just in Fat is Fast!

  • Familiarity: I've used it several times

Wow, that was New and unexpected. Just slayed a night ride on our demo rig, umm wow. I am blessed to be able to try and ride the best of the best. I currently rock a Pivot Mach 6 27.5 and am pretty enthusiastic about it. However this brought back that first feeling of aww I had when I first started working in shops. It was New, different , and inspiring. Who needs suspension , it takes a lot of maintenance. This feels like that, has better traction, is laterally responsive for the climbs, and you just point and shoot and it delivers.

Crazy fun, totally want one, with some minor additions. A dropper post is a must, and it would be nice having larger rotors, 180 would do the trick. As mentioned already it is worth getting the 29+ wheels for faster rides. But the enjoyment of the super cushy big fat tires is just rad, so depends on your riding style.

Feel free to contact me directly should you want to make any of these changes and get one on order! 801.736.6396 x 4769 Or

See ya out there!

Just in Fat is Fast!
3 5

The tube was not a surly tube.

I've bought a yampa x0 / x9.
I've removed the tire to the wheel replaced.
But I was surprised.
The tube was not a surly tube.
The tube was not only fatbike.
General was a bike tube.(kenda26x2.4/2.75]
Tubes do not feel the funk something is, it's a really good thing.
So I bought the bike only fat tube.

I think it's wrong.

The tube was not a surly tube.
Responded on

That tube will work for a fat bike wheel as it is approximately a 3 inch tube. Sometimes, for small parts, manufacturers will make substitutions that do not have a negative impact on performance.
Please let me know if you have any other questions.

5 5

Fun Bike and worth every penny!

I had the opportunity to ride this bike at Outerbike in Moab this year and had an absolute blast on it. The bike was so light weight and agile i totally forgot i was riding a rigid fatbike. If you are in the market for something to ride over the winter months in the snow or in the sand this is definitely the fatbike to get!

If you have any specific questions feel free to hit me up direct at 801-736-6396 x 4074 or

Fun Bike and worth every penny!

Are these 2014 frames and hubsets with exchangeable end cap on the rear hub to change to a thru-axle setup?

Responded on

I have done some homework on your hub question, and those hubs are not convertible . If you have any additional questions, please feel free to email me, or call. Office: 801-746-7580 ext. 4646

Is the product made ??in the USA?
Is the...

Is the product made ??in the USA?
Is the product made ??from?

Responded on

To answer your question the bike is manufactured in China. Which as you know has become a standard practice in most cases. This is not necessarily a bad thing because there are still very rigid quality assurance practices going on within this company.

If you need any other information please do not hesitate to give me a call or email me at


5 5

Great Bike

  • Familiarity: I've used it several times

This is a great Bike, I use it in the beach, in gravel road and for a medium dfficulty down hill.
It is light, ride almost over everything and the big wheels replace the suspention.

Great Bike

What is the BCD pattern on the crank's...

What is the BCD pattern on the crank's spider? In some of the photos it's 104, in others it's 94.

Best Answer Responded on


That photo you are seeing is the Surly OD crankset that Borealis originally spec'd and have made a rolling change to. The crankset spec'd on these bikes currently are the Race Face Ride 22-36 crankset which has a 104 BCD. If you have any additional questions please feel free to contact me at

5 5

Take On The Tundra

  • Familiarity: I've used it once or twice and have initial impressions

I am not a winter person. My last two winters in Utah have been spent hibernating or occasionally skiing.
I was apprehensive about riding in the snow and not expecting to have fun on board the Yampa.

After five minutes, my apprehensions were gone. The Yampa is pure fun and like nothing I have experienced before. A few spots on the trail pot marked by horses and bison became a challenge other than that, it climbs like you would expect a carbon hardtail to climb, descends with the cushioning of a full- suspension mountain bike, and rallies through ice, snow, and mud. It’s a perfect machine for taking on the Utah tundra. Borealis hit a home run with the Yampa.

At 5'6 I feel comfortable on a medium

Take On The Tundra
4 5

You Need This Bike

  • Familiarity: I've used it once or twice and have initial impressions

You may not know it yet, but his is your next bike. Whether you have a Fatbike or considering your first, this is the penultimate Fatbike experience. The carbon frame is a magnificent form that is lightweight and functional. If you already have a Fatbike, then you crave a Borealis because it's lighter than whatever you're riding. If your the uninitiated then you can head straight to first class.

I rode this bike on singletrack that was packed down from other Fatbikes and hikers. Super fun, you're basically always in a drift. With <7 psi in the tires it was pretty good traction over bumps and could hold a line through a corner well. Not gonna lie, I laid it down a few times. I actually think this would be a great bike for flat pedals since you're pretty much always in a drift and then it's easy to plant a foot. I also pulled a trailer on a packed/plowed road. It felt under control on even the most slippery sections of road and even in 4" of fresh stuff.

Hits: Great looks, lightweight, geometry is spot on, excellent build for this price, great finish.

Misses: Handlebar is narrow. A bike of this prowess deserves a wider stance. Tires had some runout, I know it doesn't affect the ride really but it makes the product feel cheap. I'd have liked slightly lower gearing for deeper snow/slower speeds. Cable actuated brakes, while reasonably priced, had very little modulation and were noisy in the cold.

Don't pass GO, don't collect $200, go directly to the checkout and cash in on the Fat fun.

You Need This Bike
5 5


  • Gender: Male
  • Familiarity: I've used it once or twice and have initial impressions

I have been a tyrannical weight weenie for the past 23 years of riding. So the thought of riding a heavy fat tire bike with the handling of a tugboat was not appealing. This thought was in the back of my mind when I checked out a Yampa demo at OuterBike in Moab. The test trail was a mix of hard pack, rock gardens, stretches of sand and tight turns. After a few pedal strokes, the overall lightweight of the Yampa's full carbon frame was noticeable. To my surprise, i wanted to hammer this bike. It was a bit of a revelation, I was passing guys on full suspension bikes without a problem. The last section of trail was made up by a long set of berms. The big tires were able turn into the berms at insane angles and the laterally stiff frame kept the bike on track. After getting a feel for the bike, i felt like a few changes could really personalize things for me. I would like to run the bike with a wide flat 720mm bar and a short 50mm stem. Also, playing with a lower tire pressure would help take the edge off some of the rocky areas of trail. Overall, I really like this bike and I can't wait to give the Yampa a try on some snow.

5 5

Hands down the best fat bike out there

  • Familiarity: I've used it several times

I've been interested in fat bikes since the Pugsley stormed the market a few years ago. I've ridden the Pugsley, Bear Grease, Mukluk, and various other fat bikes. They all felt sluggish in every condition. Although they provide a really comfortable ride quality, the handling felt more like I was trying to steer the stay puff marshmellow man into a corner, rather than a sweet fat bike. The Borealis Yampa is NOTHING like that. In fact, it is a million times better than that. While riding a Yampa in Southern Utah recently, the first thing I notice about the bike was how responsive it is. I didn't have to jerk the front tire up over obstacles as though I was sailing a yacht. When powering up short steep climbs, I never felt like my power was lost in translation, the bike just zipped up everything. The Yampa is definitely the fat bike I will be buying for all my fat bike adventuress.