1. Nerf Bars - Running Boards
  2. Westin
  3. Nerf Bars
  4. Fixed Step
  5. 4 Inch Width
  6. Black
Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel

Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel

Item # 21-24015
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Nerf Bars - Running Boards

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21-24015 - Cab Length Westin Nerf Bars
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The curved ends on these rust-resistant black powder coated steel steps give your vehicle a streamlined look. Fully enclosed ends prevent internal corrosion. Top-mounted, non-slip pads provide sure footing and rugged style. Fastest Shipping and Guaranteed Lowest Prices for Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel. Read our customer reviews of Westin nerf bars - running boards. Call 800-298-1624 for expert service or order your nerf bars - running boards part number 21-24015 by Westin online at etrailer.com.
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  • Reviews (156)
  • Q & A (5)
  • Videos (3)
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Westin Nerf Bars - Running Boards - 21-24015

  • Nerf Bars
  • Fixed Step
  • 4 Inch Width
  • Black
  • Steel
  • Westin
  • Cab Length
  • Gloss Finish
  • Oval

The curved ends on these rust-resistant black powder coated steel steps give your vehicle a streamlined look. Fully enclosed ends prevent internal corrosion. Top-mounted, non-slip pads provide sure footing and rugged style.


  • Custom-fit, cab-length, oval nerf bars make it easy to get into and out of your vehicle
    • Greater stability than narrower round bars
  • Seamless, domed ends with 30-degree bends deliver a finished, street-style look
    • Fully sealed ends keep out moisture
  • Wide, saddle-pad step areas provide sure footing
    • Raised tread makes it easy for shoes to grip the surface
    • Sturdy polymer plastic resists UV rays, fading, and cracking
  • Mild steel with black powder coat finish resists rust
  • Quick and easy bolt-on installation with included hardware
    • No drilling required


  • Tubing width: 4"
  • Step pad width: 4"
  • Step pad quantity: 2 per bar
  • Quantity: 2 nerf bars
  • 3-Year warranty

Domed ends of black bar

The PRO TRAXX oval step bars from Westin offer the best in both durability and rugged style. Sturdy, black powder coated steel construction and sealed, domed ends work together to prevent internal corrosion. Top-mounted, saddle-pad-style step pads have raised tread for excellent grip and deep grooves that allow water to quickly and easily drain away.

21-24015 Westin Mild Steel Oval Tube Steps with Wide Steps - ProTraxx Series - Black - 4" Wide

Installation Details 21-24015 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Video of Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Westin PRO TRAXX Oval Nerf Bars Review

Speaker 1: Today we're gonna be taking a look at the Westin Pro Traxx line of steel 4 inch oval nerf bars. Now if you're looking for nerf bars for your truck you probably have one of a couple of needs, either like what we have here, it's a pretty long step to get right up into the vehicle, so this is gonna give us some assistance getting in and getting out. Or you just want to improve the looks and the quality of your truck. These are gonna fit the bill really well for both purposes. Of course, they're gonna give us a step and help us in and out, but they've got the full cab length design which is really gonna compliment a lot of vehicles. Then the quality black powder coat finish that's gonna complete our tube step is really gonna give it a nice touch.

It's made to blend, whether you've got a higher line truck, or maybe just a basic trim package, the black's gonna complement both of those really well.Now our step pads are going to be four inches wide so, as you can see, they're gonna completely cover the 4 inch oval steps that we've got, and you can see the traction that they've built in here. There are a lot of surfaces for your boots or shoes to grip on, unlike some of the older styles of tube steps that they've created, these are gonna give you the traction to get in and out without sliding or slipping on them.These are designed of a material that are gonna be UV resistant, so we're not gonna have to worry about sun fade, and they're gonna stand up to a lot of the elements or the things we're gonna encounter on the road, whether it's gonna be salt, grease, oil, gas, things like that. We're not gonna have to worry about these deteriorating when coming in contact with that.Now the ends of our steps are gonna turn in towards the body. It gives them a good streamlined look, and something that I really appreciate is that the caps are completely enclosed. There's no plastic little plug that goes on the end.

That prevents moisture from getting inside the step. If you guys remember the older style tube steps that we're steel, typically they'd rust from the inside out. Water would get trapped inside and you'd see rust and bubbles, and the bottoms of them would just be gone. They've gotten rid of that problem, completely eliminated, by sealing both ends so we don't have any moisture at all inside.Our steps are also gonna be directly underneath the door where we're gonna need them the most. And some tube steps like this they don't quite think that out as well, and you might have your front pad back a little bit too far, or the back pad might be up a little bit too far.

Westin really thought it out, put's it right where we're gonna need it for getting in and out.Now something else that's really nice about the steps, if your brackets are visible, depending on your application, the way they mount kind of changes, but if your brackets are really visible and if they're gonna be something that stands out we've got these nice plastic Westin covers that go right over. It's gonna offer us a really nice clean look.And that's gonna complete our look at the Westin Pro Traxx line of the 4 inch oval nerf bars.

Customer Reviews

Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel - 21-24015

Average Customer Rating:  4.7 out of 5 stars   (156 Customer Reviews)

The curved ends on these rust-resistant black powder coated steel steps give your vehicle a streamlined look. Fully enclosed ends prevent internal corrosion. Top-mounted, non-slip pads provide sure footing and rugged style.

- 21-24015
2019 Chevrolet Colorado

Great nerfs! Easy install and they look fine on my 19 Colorado. The price was right and etrailer under-promised and over delivers with fantastic shipping! I am 73 years old and had them install with no hoist in an hour and a half. Simple tools and follow the directions for a great install.

Great! I love them!
David - 08/31/2020

- 21-24015

Pro Traxx 4 in. Nerf step bars easy installation 2 1/2 hours not bad time for someone that’s 77 years old they work good and look good.

- 21-24015

Easy install, looks great. Videos are helpful for installing

- 21-24015
2020 Chevrolet Colorado

very easy to install and look great. took me about an hour. saves wear on seat by not having to slide across to get in or out. black bars looks really good on this truck . 2021 chevy colorado crew cab.

- 21-24015
2018 GMC Canyon

This was a nice easy to install addition to 2018 GMC Canyon. It took about 90 min. to install only b/c it was getting dark. Shipping was pretty quick too !

Everything still looks great type no issues good product
Robert - 09/25/2021

- 21-24015
2018 GMC Canyon

I ordered the bars on Friday and received them at my door on Saturday. Granted etrailer is only about 70 miles from me. The bars were super easy to install thanks to the installation video in the item details on this site. And I think the bars look great and feel very solid. This wasn't my first purchase from etrailer, and definitely won't be my last.

- 21-24015

Really Nice, only took me hour and a half. Easy assemble. Boards are Nice and solid.

- 21-24015
2019 Chevrolet Colorado

Westin Pro Traxx nerf bars are nice and very easy to install. Looks great on the truck.

- 21-24015

Arrived quickly. Fits really well. Looks great!

- 21-24015
2018 Chevrolet Colorado

The nerd bars arrived in good condition,were easy to install and compliment the looks of my Chevrolet Colorado. Very satisfied with this purchase.

- 21-24015
2019 Chevrolet Colorado

I got my Running Boards and they fit my truck prefect they install easily and they look Great Thanks for a Great product and a Great Prices all my friend I have show them and they all say that they made my truck so Thanks again I will be getting other items for my truck

- 21-24015

After a year these still look like new and winters are usually harsh on everything with road salt. They installed so easily, directions were good and all the holes are already in most newer vehicles, so if you can tighten a bolt you can install them in minutes!

- 21-24015

Great product, after one year still looking good!

- 21-24015
2016 Chevrolet Colorado


- W42UR

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Ordered the nerf bars for my ram truck and received it when promised. Instruction is easy to follow and installation had no issues or problem. I really like the look of these nerf bars on my truck. Easy to order, timely delivery, great product with very good instructions and easy installation. Will order more accessories from this vendor.

- WE99FR

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Great product. Only complaint is I own a 2020 Ram 3500 LoneStar. The rear brackets fit perfectly but the trucks mounting location was different from diagram. There is no opening to fish the brackets which came with bed connecting piece. Modification took about 30 minutes but done. The directions could be clearer for sure but as for etrailer and product itself great.

- 21-23945

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

These nerf bars are great! They are very well constructed, are easy to install, and look good. The fit my 2020 F-350 perfectly. They also are a great price. I went with the matte black finish and it looks great. I like the fact that the ends of the bars welded shut unlike other bars I have had which typically have had a plastic cap over the end. The plastic cap will eventually leak and the bars rust from the inside out. These bars do ride a bit higher than my old OEM Ford nerf bars did. This gives improves the look but creates a higher step. The one thing I would suggest to the manufacturer is to supply a few extra spacer washer in the kit for the purpose of leveling it out visually.

- 21-23555

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

The nerf bars I purchased a year ago have held up wonderfully. They have no rust and the color is still fantastic. They were a great addition to my truck. They changed the look of my stock 2019 Ram 1500 completely.

Fantastic. Still like new. no looseness or rust of any kind. Great product.
Terry E - 03/27/2021

- 21-23295

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Installed one year ago on my 2015 Jeep Rubicon Wrangler Unlimited. Installation was simple, with the exception of one thing. To install the step you must permanently remove the "rock sliders" with leaves the bottom seam of the body exposed. The steps still look in newish condition, except for the color (now dark gray) which has caught up with all the black plastic on my Jeep, thanks to the AZ sun. The rubber tread can be slick when wet.

Still good, no change, no problems! Now in S Florida.
Gelatoman - 06/08/2020

- 21-23565

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Looks good hopefully last long time. I like the fact that they fit closer to the cab over my old boards

Great product works very well i think they look better than the mopar ones because the ends turn in
John G - 02/06/2021

- 21-23710

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

These are a very sturdy, good quality product! I would like to see the placement of the black step portion changed. It needs to be moved back a little for the driver and front passenger. The black portion is too far forward, so when swinging out of the cab to step down, the left foot for the driver, and right foot for the passenger, hits at the back edge of the step. My husband actually hits behind the black step portion when getting out of my truck, scratching the stainless steel bars with his shoes or boots. I can't comment on the placement of the black portion for the back seat passengers, as I have not sat back there since putting the bars on.

As I stated in my original review, the rubber steps are too far forward on the bars. When swinging your feet out of the truck to step down, they hit just behind, or at the back edge of the rubber, causing the bars to get scratched up. I can’t say for the back door steps, but the front door steps need to be back at least 6” to put them in just the right place.
Vicky - 05/06/2021

- 21-24130

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Perfect fit. Instructions very well written. Installed by myself in a little over an hour.

- 21-23945

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

I am very happy with the nerf bars. The package was missing 2 lock washers but I had some that fit so it was not a huge issue. Installation was easy. I installed them in a couple of hours. They look great on my truck and make it much easier for my family to climb in and out. I have purchased other products from etrailer (a bike rack and a hitch basket) and they were fantastic also. In my opinion this is a good company with good products and service.

- 21-53710

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Yes the nerf bars are great and went on easy and look fantastic. The BEST part of the package was the customer service! Thank you Odelia K! Talked me through the order, followed up with an email and phone call and then once received, another email making sure everything was good. WOW! Thank you!

- 21-53565

Review from a similar Westin PRO TRAXX Nerf Bars in Nerf Bars - Running Boards

Great running boards. They look great and well built. The directions provided by manufacture were horrible, but the etrailer videos were awesome at deciphering the directions. With the etrailer videos install was a breeze.

Show More Reviews

Ask the Experts about this Westin Nerf Bars - Running Boards

  • Will the Westin Pro Traxx part # 21-24015 fit my Crew Cab Colorado with Mud Flaps
    Yes the Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel part # 21-24015 is a confirmed fit for your crew cab 2020 Chevrolet Colorado. The mud flaps will be ahead of the running boards slightly so there will be no interference. Check out the linked video to see the positioning of them
    view full answer...
  • Will Westin Nerf Bars Fit 2016 Chevrolet Colorado Diesel Crew Cab
    The Westin Nerf bars, part # 21-24015 that you asked about will fit all models of the 2016 Colorado crew cabs. These are 4-inch wide Black powder-coated steel bars and require no drilling for installation.
    view full answer...
  • Recommended 2018 Chevy Colorado WT Crew Cab Running Board or Nerf Bar Step
    There are many different options for running boards or nerf bars for your 2018 Chevy Colorado WT Crew Cab. I've linked the page to all your options, but I've also singled out some recommendations for you. For a blacked out look, I recommend the Westin PRO TRAXX Oval Nerf Bars # 21-24015. For polished stainless, I recommend the # 21-54010 with the thicker step. For an easy step, I recommend the Aries ActionTrac Motorized Running Boards with Custom Installation Kit - LED Lights # AA3047904....
    view full answer...
  • Replacement Hardware for Westin PRO TRAXX Oval Nerf Bars on a 2019 Ram 1500
    The Replacement Hardware kit # 21-240PK that you referenced is actually replacement hardware for Nerf Bars # 21-24010 and # 21-24015 which fits 2015 - 2019 GMC Canyon Crew Cab and 2015 - 2019 Chevrolet Colorado Crew Cab pickups. For your 2019 Ram 1500 you would need Replacement Hardware Kit # 21-2408PK which is for the Westin PRO TRAXX Oval Nerf Bars # 21-24080 and # 21-24085. If you happen to have a 2019 Ram 1500 Classic then the correct Replacement Hardware is part # 21-2356PK...
    view full answer...
  • Will the Replacement Mounting Brackets # 21-240PK Fit My 2018 Chevy Silverado 1500?
    The Replacement Hardware # 21-240PK will only fit Westin PRO TRAXX Oval Nerf Bars # 21-24015 and # 21-24010. Unfortunately, these nerf bars are not designed to fit any 2018 Chevy Silverado 1500 models (including Z71). With that being said, there may be replacement hardware available that are designed to fit with your 2018 Chevrolet Silverado 1500 like the Replacement Mounting Hardware for Aries 4" Wide Oval Nerf Bars # AABRKT-S224046. These brackets, even though they will fit your 2018...
    view full answer...

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