5th Gen Mods, Reviews, Trail Tested

ARB Flat Alloy Rack Review 5th Gen 4Runner

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ARB Flat Alloy Rack Review

A complete overview of what it’s like to run the ARB Flat Roof Rack by ARB

After owning the ARB Flat Alloy Roof Rack for over two months now I thought it would be good to write a follow-up article.

Essentially, I want to give you any knowledge I can on this roof rack – what I like, what could be improved and what you could potentially use this rack for.

There are a lot of different aftermarket roof racks on the market, so I think it is crucial to provide thorough discussion on the ARB Flat Alloy Roof Rack. Let’s get started!

2-Month Impressions

ARB Flat Alloy Roof Rack Review


The first thing I want to mention is that I think this roof rack adds a really nice visual appeal to my 4Runner…and apparently, a lot of other people do as well as I get asked about it quite often.

Sometimes I initially install something and think it looks great, but over time I realize I like something else a little better.

This is not the case with the ARB Flat Alloy Roof Rack. I like the way this rack looks so much. This is something that does have a personal bias, but like I mentioned, quite a bit of people also seem to like this roof rack from the comments I have received in person.

Fuel Economy

Although this rack is very lightweight and low profile you need to expect a loss in fuel economy…like with any other roof rack out there.

Does this roof rack have better or worse fuel economy than other racks on the market? I can’t say, as I only have firsthand experience with the ARB roof rack. For my particular 4Runner setup and driving style I was averaging 18.3 MPG (factory roof rack and cargo bars installed) prior to installing the ARB Flat Alloy Roof Rack and 17.7 MPG after installation.

I completed over 2,500 miles of testing so I’d imagine a 0.4 to 0.8 drop in MPG should be expected depending on your 4Runner’s setup and your individual driving style. I do have a solution for this though, so keep reading.

Wind Nosie

Somewhat correlated to the reduction in fuel economy, this roof rack does produce some wind noise at highway speed. Is it terrible? No, but there is an increase of wind noise.

I think some people might not mind it at all while others may want to fix it. When I was researching roof racks it seemed evident that lots of aftermarket roof racks produce additional wind noise so the ARB roof rack isn’t any different.

Luckily, I have a solution for both wind noise and fuel economy.


ARB Flat Alloy Rack In-Use

I think this roof rack is very useful and can be suited for a wide variety of purposes. This is one of the great qualities of the ARB Flat Alloy Roof Rack – the customizable platform you can work from.

For my particular needs, I use the rack primarily for transporting my kayaks and paddleboards. It works really good at providing a nice stable platform. Since this roof rack is much longer than the factory cargo bars, I don’t have any issues with my kayaks or paddleboards touching the roof (something I had an issue with while utilizing factory cargo bars). The longer roof rack provides a much more stable and sturdier base too.

What I have found interesting about installing this roof rack is the number of things you can use it for that you wouldn’t have thought about if you didn’t have the roof rack installed.

What type of things am I talking about? Well, I recently had to transport a new mattress to my house. Typically, I would use a truck for this…not anymore. I used my flat alloy rack and some Rhino ratchet straps and I was good to go.

I can also transport lumber on top of my rack as well – something that I used to do with a truck or with boards sticking out my back window and laying on my seats; not something I like to do. Now I can put the boards on my roof rack and don’t have to worry about them rubbing my seats or moving around.

I have typically put fishing poles in my vehicle too, but they are 7-feet long and the tips of my rods lay on the center console – a similar problem to hauling some 2 x 4’s. Now, I just bungee cord my fishing poles to my ARB roof rack and travel to my fishing destination.

Although I don’t have any sort of rooftop tent, this rack would work great and I plan on getting one soon. The platform this ARB roof rack provides is excellent for mounting a tent and I think a lot of people who are looking for a solution to mounting a rooftop tent on their 4Runner should consider this roof rack.

What other things could you use this rack for?

Maxtraxx, high lift jacks, a shooting platform, photography platform and a spot to mount external lights to name a few.

I have found that the versatility of this rack to be excellent, as it is simple, but provides you with a great, low-profile platform to work from and customize to suit your individual needs and style.

What Have I Done to the Roof Rack?

Wind deflector for ARB Deflector

One of my only complaints with this roof rack is that it doesn’t come with a wind deflector…but it does produce some wind and decreases fuel economy. I am not sure why ARB doesn’t produce a wind deflector for their flat alloy rack, but they don’t so what can you do?

One option, which I originally looked into was purchasing a $150 wind deflector from Gobi. I have heard horror stories about lead times with Gobi, shipping, etc…and I also didn’t want to spend $150 for a wind deflector I’d still have to fabricate to work with my ARB rack.

Being an engineer, I decided to see if I could make my ARB roof rack a little more efficient by designing my own wind deflector.

Essentially, I made a wind deflector from the following materials:

  • 48″ x 6″ x 0.9″ of T6061 aluminum (wind deflector)
  • 1″ wide by 0.1″ thick T6061 aluminum (wind deflector brackets)
  • 5/32″ fuel / vacuum hose from AutoZone (rubber for wind deflector on the bottom where it touches the roof)
  • RTV silicon (to adhere the 5/32″ hose to the wind deflector
  • Rust-oleum Self-Etching Primer
  • Rust-oleum Semi-Gloss Black Acrylic Enamel
  • Rust-oleum Gloss Clear Acrylic Enamel
  • Stainless Steel bolts and nylon locking nuts

I shaped the piece of aluminum for the wind deflector as best as I could to fit the profile (or the curvature) of my 4Runner’s roof, bent brackets to mount the wind deflector, painted the brackets and wind deflector and then adhered a piece of rubber to the bottom of the wind deflector so it wouldn’t scratch the roof. I know this is pretty quick and vague, but unfortunately, fabrication work sometimes isn’t super detailed, it is more of an art.

So how well does my custom wind deflector work?

Wind deflector for ARB Deflector

I will admit, I didn’t think the wind deflector would increase my fuel economy by much. However, after 2,200 miles of testing I have improved my fuel economy from 17.7 MPG (without wind deflector) to 18.3 MPG (with wind deflector). What!?!? Yes, I know this sounds crazy, but the wind deflector made a tremendous difference and increased my fuel economy by 0.6 MPG. Wind noise has been drastically reduced, and of course my fuel economy has been improved as well.

Unfortunately, ARB does not produce a wind deflector for this roof rack, and I can’t say if they are working on one for the future.

I can say the wind deflector I made has worked unbelievably well and has been a great addition to my ARB Flat Alloy Roof Rack.

What Will I Add in The Future?

ARB Flat Fence rack for 5th Gen 4Runner


One item I am looking at is a ladder that goes on the rear lift gate so that you can climb onto the roof rack. I don’t think the ladder is as necessary as the wind deflector, but I would like to get on my roof rack to shoot from and take some photos. There are some options out there for a ladder, such as Gobi and C4 Fabrication.

I am planning to install a C4 Fabrication Summit Ladder soon and I will provide a write up on how that works with the ARB Flat Alloy Roof Rack.


Although I have quite a few lighting upgrades on my 4Runner you can never have enough. Some of the lights I might mount to the ARB roof rack would be ditch lights, side scene lighting and reverse lighting.

Traction Pads / Boards

I do not know if I will utilize my future C4 Fabrication ladder or ARB roof rack, but one day I am going to get some recovery boards and I will mount them to either my roof rack or future C4 ladder. I am undecided on which option would be best, but I think the roof rack would be a great location.

Is the Flat Rack Design Good or Bad?

ARB Flat Fence rack - Good or Bad Design?

There are two primary styles of roof racks on the market – flat and basket. This ARB roof rack is flat of course, but other popular options such as Gobi are basket style.

Here is my opinion. I think a flat rack works best if you use your 4Runner as a daily driver and want minimal wind noise and loss in fuel economy. Basket racks may be better if you are constantly using your 4Runner for overlanding or expeditions…but not many people do this and you will have additional wind noise, loss in fuel economy, weight and bulkiness from a basket style rack.

Another aspect that I really appreciate about the ARB flat rack design is the low profile. I park my 4Runner in a garage and I don’t have much room to spare. If you also park your 4Runner in a garage or parking garage, make sure to take into consideration the additional height an aftermarket roof rack can provide. Luckily, the ARB Flat Alloy Roof Rack doesn’t provide much additional height.

All this said, I prefer the flat rack design. I wanted something that was sleek, lightweight, low profile, fuel efficient and customizable to my personal needs. The ARB Flat Alloy Roof Rack provides just this.


Overall, this roof rack from ARB is amazing! It is low profile, lightweight and sturdy. I wish ARB made a wind deflector that pairs with the roof rack in order to provide reduced wind noise and increased fuel economy, however this isn’t a determining factor in my opinion.

I believe this roof rack is amongst the elite options on the market today. One of the biggest selling points to me is it is made from aluminum…much lighter and corrosion resistant than steel. You never want to add a lot of weight at the highest point on your vehicle.

Without hesitation I would recommend this roof rack to others for the quality, strength, appearance, reasonable cost and versatility that the ARB Flat Alloy Roof Rack provides.

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June 15, 2020 11:42 am

Curious about what tire size/setup you have, I love the way yours looks and sits! Also is it stock suspension?

Kevin L.
Kevin L.
November 18, 2019 12:08 pm

Where did you get your aluminum sheet to fab the fairing. I have this same exact same rack on my 4runner and agree the wind noise and MPG loss is a bit more noticeable than I like. Thanks!

Nick Craft
Nick Craft
February 3, 2020 12:17 pm
Reply to  Clint Taylor

Clint, I would love more info/pictures if wouldn’t mind. I originally bought the rack based of this review and 6 months later love everything, but the lack of a wind deflector.



July 31, 2019 2:09 pm

Hi Clint, thanks to your articles I think I’ve settled on the ARB flat rack but need to make sure it clears my garage. Could you provide the height in the back from your antenna fin to the top of the rack? Thanks!

Clint Taylor
Clint Taylor
August 3, 2019 9:17 am
Reply to  Harold

Harold, the top of this rack is about 1.75” above the top of the rear shark fin antenna. To play it safe, I’d use an estimate of at least 2”. I hope this helps!

August 5, 2019 4:20 pm
Reply to  Clint Taylor

Can you tell the measurement overall from the roof? I’m torn between this and a baja rack which is only 4″. The lower rack wins! Arb is just terrible to find info on.

Clint Taylor
Clint Taylor
August 5, 2019 5:57 pm
Reply to  Joe

Joe, this rack is about 4.25” above the roof. One thing to consider is this rack is aluminum…good resistance to corrosion and lightweight.

July 20, 2019 5:36 pm

Good article, I’ve been looking my self quite a while for a roof rack that pretty much is multi-purpose, and has the good looks, I guess you just sold me an ARB, thanks

Clint Taylor
Clint Taylor
July 21, 2019 6:54 am
Reply to  Sal

Sal, this roof rack is a good one. I hope you like it!

May 6, 2019 2:08 pm

Neal, if you have not read the write up on the ARB 70X44 rack, I would suggest going over it. I agree with you that ARB really does not do to great of a job for the private customer. However, the rack is awning friendly. You will need the awning brackets that bolt to the rack. Check online at some of the 4runner exclusive sites; most have these brackets.

May 6, 2019 11:49 am

Im interested in the ARB flat aluminum rack but ARB’s website is so horrible, I can’t find any details regarding.. Are there any rail options for the flat aluminum rack? Or is it just the flat rack only? I know that you can probably add the ARB awning onto this rack, but I can’t find any info for accessories.. I want a flat aluminum rack since its much lighter than steel, but I also want options to add rails to secure more bulkier items (like a cage or basket) to secure on..

May 1, 2019 2:06 pm

Roger,,, WilCo

April 30, 2019 4:01 pm

Sounds like we have the same rack & ladder combo in mind. Today I sent C4 an email to verify the fit before placing the ladder order,,, they replied with “not sure”. Honestly, I see no reason/obstruction related to fit.

July 6, 2019 6:15 am
Reply to  Clint Taylor

Any progress report for the C4 ladder with the flat rack???

Clint Taylor
Clint Taylor
July 6, 2019 12:09 pm
Reply to  Treetop

Not yet…I hope to get the ladder installed very soon!

September 7, 2019 9:32 am
Reply to  Clint Taylor

Thanks,,, look forward to the review.

April 18, 2019 8:56 am

Here’s the thing. We just got a call from 4Wheel Parts. ARB sent the wrong roof rack. We had ordered the flat mesh one but they sent one that is flat but no mesh, just crossbars. We’ve decided to go ahead and have this one installed since we’ve been waiting a couple of months. Sabrina at 4Wheel Parts said the mesh one might not be the best rack for a tent. Something about the mesh shape being welded at each diamond on the cross bars and not being adjustable. I’ll report back once we pick it up tonight. Re the… Read more »

April 16, 2019 4:34 pm

Because of your review on this roof rack, we ordered one about a month ago. We’re getting it installed this Thursday!
You say you haven’t gotten a rooftop tent — you certainly should soon. We use ours all the time. It’s mounted on our Tacoma. Once we get the roof rack installed, we’ll be using it on my 4Runner.

April 13, 2019 4:13 am

What dimensions are your rack? I know there are several different lengths

Clint Taylor
Clint Taylor
April 13, 2019 5:01 am
Reply to  Zack

Zack, the rack is the 70” x 44” flat alloy roof rack.

Steve Carter
Steve Carter
April 12, 2019 9:11 am

Clint, thanks for very nice article. Very helpful for my decision about rack for new 4Runner.

Clint Taylor
Clint Taylor
April 12, 2019 9:13 am
Reply to  Steve Carter

Steve, I’m glad it helped out!

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