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Tomahawk Fat Bike Ready Upright Mount

4 out of 5 stars
5 Reviews

Out of Stock

Don't worry though, we have a lot more Bike Roof Racks in stock than that.

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Why We Like The Tomahawk Fat Bike Ready Upright Mount

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
  • Item #RMO000I
Bike Capacity
all bikes 20 - 29 inches, fat bike
Part Number
travel, cycling, mountain biking
Manufacturer Warranty

Overall Rating

4 based on 5 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 1 reviews
3 Stars - 1 reviews
4 Stars - 0 reviews
5 Stars - 3 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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3 out of 5 stars

April 23, 2021

Easy to use. Works well. Some cheapness.

I've used it several times

I'd give it a higher rating but it's got some downgrades from previous models that are inexcusable. I don't mind putting the rack together, all-in-all it took only about 5-10 minutes. The frustrating process is installing it on the roof of your car. Previous models were much more user-friendly with a strap design that would wrap under the bar and slot into the rack, then tighten with a single 6mm allen key. The current model uses a total of 6 allen bolts, three more than the aforementioned previous model. It's not nearly as easy to swap from vehicle to vehicle and installing the rack takes 3x as long. Previous models would also come with locks for the same price. However, I do think this is one of the better and most secure roof racks on the market and I still recommend it. It's great that it fits basically every bike on the market without the need to purchase adapters.

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Casey G
2 out of 5 stars

March 1, 2021

I'm not happy with it

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

I have to dissent with the other reviews. I think it's made as cheap as possible. The tray is actually in 2 parts, the wheel hoop is screwed on so that is 2 parts. Then there is the issue of the wheel straps - 3 parts per wheel. You have the separate sides of the 1st strap set that can become misaligned, then the add-on strap extender. So that is 2 adjustments. That might all be fine, but a 4 inch tire conflicts with those very straps and release button because the tray is so slim. Also one end cap broke off on first use. Oh and if you want to switch the arm from driver to passenger, it's not very easy to writhe out of the base and replace in the other direction. I about sent it back then and wish I had. I've also never encountered plain plastic mounts - most other brands have some rubber between the cross bar and rack. This is just plastic on crossbar so not much friction there. I don't trust it. This is the worst thing I've bought from Rocky Mounts. I just expected a lot better.

Some D
5 out of 5 stars

November 25, 2020

Fantastic Roof Mount Bike Rack

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

The Rockymounts Tomahawk is a fantastic bike rack if you are looking to carry your bikes on your roof crossbars and you don't want to remove the front tire. It's heavy duty, well engineered, and makes loading/unloading a bike very easy (I'm 5'11" and my car is a Civic). It fits a wide variety of wheel sizes. Although it is listed as a Fat tire bike carrier, it holds my 700x23c road bike or my 27.5x2.3" mountain bike equally securely. This is the first Rockymounts product I have purchased. I'm certain that it won't be my last. To top it off, Backcountry offers the Tomahawk at a great price with rapid shipping. Win-win!

Mark N
5 out of 5 stars

November 11, 2020

Great rack

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

This is a well built, sturdy rack. It fits my 2.8 tires nicely without needing to use the fat bike extender (which is included regardless). It was 3/5 annoying to put together, it took about 20 minutes and I needed to use a youtube video because the included instructions were not very helpful. As with all roof racks, it is a challenge to get a MTB on. I am 5' 6" and have a subaru outback and I can manage to get it on the car but I feel like I risk slipping every time I do it -- much more comfortable with a little fold up stool which I just pop in the car every time I ride.

Emily L
5 out of 5 stars

September 23, 2020

Fast, easy, reliable.

I've used it several times

I've only used this with a road bike and it's great. It took about 10 minutes to install it on my crossbars. It's nice not having to take off the front wheel, but you should know racks of this style (not specific to this rack) are less theft proof even with the lock cores because someone could just take a wheel off the bike and walk away with everything. Great rack though, the lock core is still a good deterrent, and I just lock the bike to the roof rack with a bigger lock if I'm ever away from the car for a longer time.

Christopher V