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  1. Nerf Bars - Running Boards
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  3. Nerf Bars
  4. Fixed Step
  5. Cab Length
  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
Our Price: $342.17
You Save: $92.26
Nerf Bars - Running Boards

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Shipping Weight: 52 lbs
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Westin Oval Nerf Bars - Running Boards - 21-24015
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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 Great prices for Westin PRO TRAXX Oval Nerf Bars - 4" - Black Powder Coated Steel. Read our customer reviews of Westin nerf bars - running boards. Call 1-800-940-8924 for expert service or order your nerf bars - running boards part number 21-24015 by Westin online at
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Westin Nerf Bars - Running Boards - 21-24015

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

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

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (279 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.

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!

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.

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.


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.

2019 Chevrolet Colorado

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


Easy install


Easy install, looks great. Videos are helpful for installing


Hey Carol ups delivered damaged. Carton recouped.End of step scratched, would have painted. Center of step big dent.

Brooke M.


oh no! That really bites. I am glad to see that our customer service has already jumped on this and is working this out with you.


Arrived quickly. Fits really well.



Yes, my Nerf bars are great! Installation was pretty easy by myself. Strong sturdy. Still look brand new. Highly recommend them.


great product, easy installation. looks great on wifes truck. being short , she needed a step to get in . flows nice with the truck body lines. I think the 3;; would have been too narrow . so glad I chose this one.


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

2022 Chevrolet Colorado

Once again I received great service from etrailer and the Nerf Bars arrived on time. They fit my 2022 Colorado perfectly, are sturdy and look great.

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


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!

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.

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


Great product, after one year still looking good!

2016 Chevrolet Colorado



Parts fit and installation was a breeze. The instructions should tell you that brackets have a stamp for location: Driver Side and Passenger Side. Found out via [online] (PF = Passenger Front, DF= Driver Front, PR = Passenger Rear, DR = Driver Rear. Otherwise the running board looks great


Super easy to install, so save yourself a little time and put the little black plastic vanity pieces on before you mount anything to the vehicle..did passenger that way and it was much easier. Even with doing the drivers side the order of instructions it still only took 45 minutes start to finish, had I done both sides with the vanity pieces first probably would have been done in 30 minutes.


We were able to mount the running boards in a bout 2 hours total. They are very sturdy, everything lined up exactly, and they look Great! I had to call tech support because the instructions had not been updated to make sure it would fit my 2019 4Runner. They answered the phone quickly and confirmed that they would fit all the way up to a 2023 4Runner and they were easy to mount!


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.


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.


Good points:
The rails and brackets lined
up pervert with the Dodge provided rod posts.
All in all installation was tight and sturdy.

Not so good points:
The stainless finish lacked a brilliant shine that I expected.
Had some dull spots. Stainless thickness gauge seamed a little light.
Installation instructions we’re not clear.
Brackets instructions should have diagram showing the layout.
Hardware could of been labeled better as well.


We really like the look and fitment of the nerf bars, however, the steps are a little too slick when it gets wet.

Show More Reviews

See what our Experts say about this Westin Nerf Bars - Running Boards

  • 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...
  • 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 PRO TRAXX Nerf Bars Fit 2022 Chevy Colorado ZR2 Crew Cab
    The correct 4" Westin PRO TRAXX Oval Nerf Bars for your 2022 Chevy Colorado ZR2 with the Crew Cab is found as part # 21-24015 on our site. I reached out to my contact at Westin and they were able to confirm that the ZR2 fitment is no issue with this kit. Attached is an installation video of this kit on a 2021 Colorado for you to check out!
    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...
  • 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...
  • 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 which...
    view full answer...

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Info for this part was:

Employee Leah B
Edited by:
Leah B
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Randy B
Installed by:
Randy B
Employee Mary K
Written by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Jessie B
Updated by:
Jessie B
Employee Isabelle B
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Employee Zach D
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Employee Robert C
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Robert C
Employee David F
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