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Borealis Bikes Yampa X0/X9 Complete Bike

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Item # BOR0001

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Item # BOR0001


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

sizing chart

Bike size by rider height


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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Great ride...

  • Familiarity: I've used it several times

I wanted a bike that would break up my rides in the winter on rollers in the basement. Haven't had it during the winter yet but riding it in back country has been an absolute blast! No terrain... hills, dirt, mud... is an issue that it doesn't plow right through. Hills, rather up or down, is a breeze. I love it!

Fun to ride

  • Familiarity: I've used it several times

I ride a lot of single track, gravel roads and ATV. trails, the Borealis Yampa really handles these trails nice. Goes over rock gardens with ease and rolls thru ruts as well. The Borealis looks great black bike with red trim and wheels I love the red wheels. I cannot believe the bike was under $2300 just unbelievable price and it was easy to setup right out of the box.

Avg. ride time: 3h 32m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Makes me smile

  • Familiarity: I've used it several times

Purchased from CC this past winter, initially just to ride in snow.

Huge props to CC/BC - 3rd bike i've purchased from them and everytime price, service, delivery, etc. have been terrific.

Re bike - put a few hundred miles on it; snow, dirt, sand/beach. Obviously takes some getting used to w/ larger tires etc., but bike is (relatively speaking) light as feather, handles super well, and is a blast to ride. As others have indicated, soaks up roots and rocks really well. I liken it to riding a sofa over some of the bumpy stuff. It's a blast in the snow and lots of fun riding on the beach.

My only complaint - and it's not really a complaint as i knew what I was getting as I bought the bike on sale and at a large discount - is that I'd love to change the drivetrain to a 1X... XOX9 is fine/dependable however.

FWIW, I don't find the red rims particularly outlandish and they pair nicely w/ the red/black frame... and I'm older than Paul below.

The Phat fat bike!

    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

    The Phat fat bike!

    can you add after market front suspension forks?

    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.

    Yes you can run a Bluto on it, but you would need 150mm front hubs, the stock 135mm would not work. Also, the Bluto will only work on the L and XL Yampa, and recommended 80mm travel not 100mm. Internet search reveals the above answer straight from Borealis

    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

    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.

    BRIGHT RED RIMS - Without a Warning.

    • 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.

    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.

    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.

    I had the same issue as Paul but they did email me to tell me that the rims would be different. I debated on canceling myself but felt it was a good price and with the savings upgraded to a 1x and some other changes. I was VERY disappointed too with the rims, for me more because of weight and I would have much preferred the marge lites. The upside is I feel more inclined to in put on bigger tires with the wider rim. I ordered the bike based on a friend ordering the black and white and his did come with the marge lite rims...big weight difference. At minimum, by now, they should update this site with correct information.

    Avg. ride time: 20m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    First fat bike and now I am hooked!

    • Familiarity: I've put it through the wringer

    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.

    UPDATED: 1/7/16

    Well thought I'd update the review given I now have around 500 miles of dirt, hardpack, mud and snow ridding on the Yampa. In summary still love it. The snow riding is a blast although the Surly Knards 3.8" that came with the bike suck in the snow...they are awesome and roll fast on the dirt but for winter riding I put on some 45nrth Dillinger 5's...along with some pogies (best money spent in cold weather). I also put a Wolftooth 1x setup on the front and ditched the front 2x...cleaner and less screwing around with adjustments. Only grip and this is a minor one is for some reason the "carbon creak" on this bike seems to be very the point I am going to strip the bike down completely this spring to redo it; was hoping that would be after owning it at least a full year but the noise is annoying the #$%@ out of me.

    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?


    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.

    Model year 2014, frames produced in 2014 and 2015 though with no change. Not recommended to mount a bluto - will void warranty, and a bluto does not have the correct offset. Borealis brand hubs, 135x15 front, 197x12 rear. Not sure exactly how BC ships these but very minimal assembly should be required on your end - bar install, wheel install, stuff like that.

    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!

    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.


      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.

      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?

        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?

        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



        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


        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