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  • RockyMounts Tomahawk Fat Bike Ready Upright Mount
  • RockyMounts Tomahawk Fat Bike Ready Upright Mount Side
  • RockyMounts Tomahawk Fat Bike Ready Upright Mount 3/4 Front
  • RockyMounts Tomahawk Fat Bike Ready Upright Mount Side
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RockyMountsTomahawk Fat Bike Ready Upright Mount

Item # RMO000I

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Item # RMO000I

Holds everything.

When the innovative minds at RockyMounts decided that fat bike racks were too few and far between, they created the Tomahawk Fat Bike Ready Upright Mount. With the overall structure carried over from the venerated BrassKnuckle and its new capability to fit any bike ranging from 20-29 inches with any road, mountain, or fat tires, we think the Tomahawk is a valuable addition to the current crop of roof racks being offered.

RockyMounts set out to make the Tomahawk as adaptable as possible, creating it with an interchangeable arm so that it can be mounted on the driver or passenger side of a vehicle with a swingarm that will hold your precious cargo in place without touching its frame. To accommodate a fat bike, RockyMounts includes two wheel strap extensions that work with tires up to five inches wide, as well as universal hardware that will pair effectively with any style of crossbar on your vehicle.

  • Do-it-all upright mount than can even handle fat bikes
  • Fits any bike ranging from 20-29 inches, and up to 5 inches wide
  • Interchangeable arm can be mounted to either side of car
  • Universal hardware is compatible with most roof crossbars
Tech Specs
Tech Specs
Bike Capacity
all bikes 20 - 29 inches, fat bike
Locks Included
Recommended Use
Manufacturer Warranty

Reviews & Community


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Not for XL Bikes

  • Familiarity: I returned this product before using it

I've been searching for a roof top bike rack for my Fat Bike that didn't cost an arm and a leg. The Tomahawk appeared to fit the bill. I bought the rack and installed it only to find out my XL Fat Bike was only hanging on by a thread at the end of the rack. I'm not risking my bike on that. I had an issue getting the straps to stay in the track once they were installed. I also did not like how the arm locked on. It was rubbing the frame - but that could be related to the fit. My XL 29er does not fit either. Overall, the rack is a solid build once you get it on the car. Installation is rather tricky as the instructions are not as clear as they could be (I'm an engineer and had to make educated guesses to get it installed correctly). If I had a smaller bike that actually fit - I'd give this rack 4 stars - minus 1 star for the installation.


  • Familiarity: I've used it several times

Feels very overbuilt. Not just for fat bikes, this fits my 2.4" wheels like a champ.

best fatbike carrier

  • Familiarity: I've put it through the wringer

after installing it on a Yakima crossbar(already had Yakima bike carrier on my car), loaded the fatbike on the carrier and went out for test to see fatbike on the roof will hold or bike fall off. carrier did the job and no problem with carrier. you have to install it correctly(read all the instruction), otherwise carrier will not work

Unanswered Question

any chance the lock cores from Yakima will work with the Rockymounts? Converting for the fat bike and have the Yakima cores.

Best Carrier

  • Familiarity: I've put it through the wringer

it is easy to install on round load bar or blade load bar. it really is easy to like it says. it is the best one of the fat bike. you can use it carry any types of bike you have. I have full carbon fat bike and don't like to take front wheel off to load it on the carrier. with this carrier you don't have to take wheel off at all


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

I'll give it 3 stars because it holds the fat bike well enough, and it's a quick process to add/remove the bike. However, I wouldn't recommend the Rockymounts Tomahawk if you like to frequently remove your bike carrier from the crossbars (to use the bars for carrying other items). Installation is ridiculous. It requires lining up four 2-2.5" allen bolts on front and back, for 8 total, which really inhibits quick removal and installation. My hand was literally sore after screwing in all of these with the supplied allen.

I'm surprised how bad this is to install, not hard, but time consuming. My 15-year-old Yakima fork mount carriers go on and off in a couple minutes, this thing would take at least 20. It's the kind of attachment I'd come up with wandering around home depot...couple plates and some bolts. Also have to remove the rear tray "cap" to slide the mount off the back, which I'm sure will be enjoyable (needed a mallet to push them on). I'd expect more thought put into this design. If they could've halved the number of bolts, or put knobs on them, it'd be much easier, if still a bit clunky.

Also, a 35 lb maximum for a rack touting fatbike capacity? Many fat bikes are over 35 lbs.

Weight limit is listed as 40lbs, which albeit close, covers the majority of fat bikes on the market. Anything heavier probably shouldn't be going on the roof anyway.

Wow, that's funny. It said 35 lbs in the instructions that came with mine (which I still have and double checked). I see on the online pdf it now says 40 lbs. I wonder if they changed something in the design, or just the literature! The latter seems more likely. Shady.

Also, many fat bikes can easily come in around 35 lbs or more with wider winter tires and a bluto. 40 is certainly better, if legit.

Unanswered Question

Will this work on factory crossbars on a 2012 Subaru Forester?

Great rack at a competitive price!!

  • Familiarity: I've used it several times

I already had a Rocky Mount BrassKnuckles rack, and liked being able to throw my bike on the roof securely with both wheels attached and no contact from the rack to the bike frame. I liked it so much, I was in the process of buying a second one, along with the FatBike adapter (around another $20) when I saw that RockyMount had released the Tomahawk. They are functionally the same, though the BrassKnuckle seems finished a bit more nicely, and the Tomahawk comes ready to carry large tire fatbikes. So, the same functionality of the rack I really like without the need to buy an additional adapter to carry my Moonlander. RockyMount saved me $70.

Unanswered Question

Is there a bike weight limit on these?