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Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars - Qty 4
Yakima

Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars - Qty 4

Part Number: Y03539
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$48.95
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These easy-to-use adapters let you mount round and square bar carriers and accessories on Yakima CoreBar and JetStream crossbars. Brackets use your accessory's existing hardware - no tools required. 1-800-940-8924 to order Yakima accessories and parts part number Y03539 or order online at etrailer.com. Free expert support on all Yakima products. Great prices and Fastest Shipping for Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars - Qty 4. Accessories and Parts reviews from real customers.
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  • Reviews (24)
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  • Videos (1)
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Yakima Accessories and Parts - Y03539

  • Roof Rack
  • Adapters
  • Yakima
  • MightyMounts

These easy-to-use adapters let you mount round and square bar carriers and accessories on Yakima CoreBar and JetStream crossbars. Brackets use your accessory's existing hardware - no tools required.


Features:

  • Adapters let you mount round and square bar accessories on your Yakima CoreBar and JetStream crossbars
  • Easy, tool-free installation - adapters use existing accessory hardware
    • Replaces your accessory's existing mounting brackets
  • Durable nylon construction


Specs:

  • Application: Yakima HighRoller (Y02091), King Cobra (Y02084), and Raptor (Y02085) bike racks; WheelFork (Y02067) wheel carrier; HullRaiser (Y04035), Kayak Stacker (Y04036), Mako Saddles (Y04037), HullyRollers (Y04035), and LandShark (Y04030) kayak carriers; and BasketCase (Y07012) cargo basket
  • Maximum crossbar dimensions: 3-1/8" wide x 1" tall
  • Quantity: 4 mounting brackets
  • Limited lifetime warranty


8003539 Yakima Mighty Mount 39H Accessory Adapter for CoreBar and JetStream Crossbars - Qty 4

Installation Details Y03539 Installation instructions



Video of Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars - Qty 4

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




Video Transcript for Review of Yakima Mighty Mount 39H Accessory Adapter CoreBar And JetStream Crossbars - Y03539

Hi everybody, Andy here with etrailer.com, and today we're gonna take a brief look at these MightyMount 39H Accessory Adapters for Yakima CoreBar and JetStream crossbars. These easy-to-use adapters are going to let you mount round and square bar carriers and accessories on your Yakima CoreBar and JetStream crossbars. This is going to be compatible with the Yakima HighRoller, King Cobra, and Raptor bike racks, and then the WheelFork wheel carriers, the HullRaiser, Kayak Stacker, Mako Saddles, HullyRollers, and LandShark kayak carriers, and then the BasketCase cargo basket. And on your screen, I'm also including the model numbers of those items that these these adapters are going to work with. This is going to be an easy tool-free installation. These adapters use your existing accessory hardware, and these are going to replace your accessory's existing mounting brackets.

The maximum crossbar dimensions, as you can see there on your screen, is three and 1/8 inches wide by one inches tall, one inch tall rather. And these are of a durable nylon construction, so they are durable. You are going to receive four of these mounting brackets. Instructions are included, as you can see here, and these do have a limited lifetime warranty from Yakima. Well, that's gonna conclude our brief look today.

I do hope that it was helpful for you. Again, my name is Andy. Thank you for joining me.

Customer Satisfaction Score:


Customer Reviews

Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars - Qty 4 - Y03539

Average Customer Rating:  4.8 out of 5 stars   (24 Customer Reviews)

These easy-to-use adapters let you mount round and square bar carriers and accessories on Yakima CoreBar and JetStream crossbars. Brackets use your accessory's existing hardware - no tools required.

by:

After years of having accessories for Yakima round bar racks I finally moved from cars to a truck and these fit the cross bars on my bed rack perfectly and I don’t have to replace any of the Yakima accessories that I already own. The parcel arrived quickly and I couldn’t be happier with the order or the service.



by:

I have a 30+ year old Thule tandem rack. I was determined not to shell out another $xxx+ to buy a new one, just because I wanted to convert from the Thule square crossbars to aero bars. After conferring with an eTrailer expert about mighty mount load limitations, I purchased these mounts instead of trying to rig my own solution. I’m using all four mighty mounts to attach a Thule tandem rack onto Yakima Corebars. My Yakima rack system is attached to my truck via the t-slot rails on a RetraxPro XR tonneau bed cover. With the Corebars sitting on Skyline towers, the mighty mounts serve as a perfectly flat platform for the mounting plates on the tandem rack. I attached the tandem rack to the four mighty mounts using 2 ½ inch by ¼ inch Grade 8 hex cap course screws, some fender and flat washers, and a nylon insert lock nut; all purchased from my local hardware store. I did need to tilt the Corebars forward with the Skyline tower adjusters to level the mighty mount top surface. No issues with turbulence noise. Total load on the four mighty mounts totals 70 lbs including both the rack and tandem bike. Thanks etrailer for the advice, the parts, and the great customer service!



by:

Looking forward to using these with my high roller bike rack. :)



by:

I am currently using these Mighty Mounts (4) to hold an ARB awning to OEM roof cross bars on a 2022 Tacoma. I have to say, they are pretty sturdy and rigid enough that the awning doesn't vibrate or move at all at speeds above 65mph. I absolutely recommend them if you don't want to drill or make any major modifications to an OEM roof bar that you might have installed in your vehicle.



by:

Yakima products are Great.



by:

I used these to adapt an old Yakima rack to my Subaru Outback roof rack cross bars.
Getting these to work with the older rack saved us some serious money.
Thanks Etrailer!



by:

Easy, solid conversion that allows us to continue using all of our old carriers on our new rack. Perfect for kayak cradles.



by:

The mighty mounts fir perfectly on my rack system... excellent quality... speedy shipping as well. Looking forward to mounting my kayak system before summer.



by:

Shipping was extremely quick and packaged well. Product works great on crossbars.



by:

It was a struggle getting (Global parts shortage) these but the Etrailer team made it happen..



by:

Excellent shipping and tracking coordination. Product delivered as represented and performs as expected.



by:

Works great to fit our 2016 Town and Country roof top bars to my hilly rollers kayak carrier!



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Fast and accurate.



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Great service; order arrived 5 days before expected delivery date.



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Thank you Adam E for the excellent communications. Great transaction with fast shipping.



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See what our Experts say about this Yakima Accessories and Parts

  • What is the Difference Between the Mighty Mount 39H and 23H Accessory Adapters
    The Mighty Mount 39H # Y03539 and 23H # Y03523 Accessory Adapters are pretty much the same thing and will be compatible with 3-1/8" wide x 1" tall crossbars. The biggest difference between these adapters is that the 39H is designed specifically around the Yakima CoreBar and JetStream crossbars while the 23H is geared more towards factory crossbars which can be a little thinner which is why this kit comes with the shims for a better fit if necessary. So you just need to choose the adapter...
    view full answer...
  • Correct Mighty Mount Accessory Adapters for OEM Crossbars on a 2022 Tesla Model 3
    The Mighty Mount 39H Accessory Adapter # Y03539 will fit the OEM aero-style crossbars on your 2022 Tesla Model 3 but for a better fit I recommend using the 23H Adapters # Y03523 instead. These are essentially the same thing but they also come with shims that are sometimes needed for factory crossbars as they tend to be a little more slender than the JetStream or CoreBar crossbars from Yakima.
    view full answer...
  • How To Adapt Yakima Raptor Single Bike Rack To Malone Air Flow 2 Rack
    We have just the perfect adapter for you! The Universal MightyMounts for Yakima Roof Mounted Accessories # Y03590 per Yakima will adapt your Yakima Raptor Single Bike Rack to the Malone Air Flow 2 Rack. They install easily with no tools. They will fit round, square, or factory roof racks. The Lock Cores # Y07204 (sold separately) will allow you to lock down your bike rack onto the bars. I attached a review video link below.
    view full answer...
  • Recommended Yakima Mighty Mounts For Curt C18118 Roof Rack
    You can use the Universal MightyMounts for Yakima Roof Mounted Accessories # Y03590 on the Curt # C18118. The Curt roof rack bars are a little bit of an odd shape, but you'll be able to make them fit a bit tighter than you would the Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars # Y03539.
    view full answer...
  • Will Yakima 39H Mighty Mounts fit on Rhino-Rack Aero Bars on 2018 Jeep Grand Cherokee?
    On your 2018 Jeep Grand Cherokee with black and chrome roof rails the Rhino-Rack RVP Roof Rack # RRRVP27 is confirmed to fit. The Rola APE rack has a slick aftermarket look and will mount directly to the flush roof rails on your 2018 Grand Cherokee. The crossbars in both options are 3-1/8" wide x 1" tall so the Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars - Qty 4 # Y03539 will fit and allow you to use your older Yakima ski rack. I've attached photos to...
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Parts Needed to Adapt an Older Yakima Ski Rack to Yakima JetStream Cross Bars
    What you need is the Universal MightyMounts for Yakima Roof Mounted Accessories # Y03590. These mounts will fit ski racks made as early as 1990 and are the most likely option for adapting your older Yakima ski rack to your JetStream cross bars.
    view full answer...
  • Will Yakima MightyMounts Fit on a Yakima Overhaul HD Crossbar
    I may have a solution for you, but there is not a Mighty Mount adapter like the # Y03539 that will work on the Yakima Overhaul HD bars, so you wouldn't be able to use an older Hully Roller system. However, the newer Yakima roller systems like the Hand Roll # Y04082 (1 set of rollers) or # Y04082-2 (2 sets of rollers) are compatible with the Yakima HD bars with their existing mounting clamps. This would be the only option available for this setup, but any Yakima kayak carrier sold after...
    view full answer...
  • Will Yakima MightyMounts Work on Rhino Rack Vortex Aero Crossbars?
    If you have the Yakima Universal MightyMount Adapters, part # Y03590, you are in good shape. The Universal MightyMounts will work with all aero style crossbars that are no more than 4 inches wide or 1-1/2 inches tall. The Vortex bars are just 3-1/8 inches wide and 1-3/16 inches tall, so they will be a good fit. If you have the Yakima MightyMount 34H or the 39H, part # Y03539, you will need to replace them. These are specifically contoured for smaller factory aero bars and will not work...
    view full answer...
  • Does Thule Compass Kayak Roof Rack Require Adapter to Fit Yakima JetStream Bars
    The Mighty Mount # Y03539 is designed to adapt certain Yakima accessories designed for round and square bars to the JetStream bars like # Y00426. Fortunately, the Thule Compass Kayak Roof Rack # TH890000 does not require an adapter and will have no problems fitting Yakima JetStream crossbars.
    view full answer...
  • Yakima MightyMounts for Malone AirFlow 2 Roof Rack Crossbars
    You will need to use the Universal MightyMounts # Y03590. They will crossbars that are up to 4 inches wide and up to 1-1/2 inches tall. The AirFlow 2 bars are 3 inches wide and 1 inch tall so they are within the range accepted by the Universal MightyMounts. The 39H model, # Y03539, were designed specifically for the Yakima CoreBar and JetStream crossbars which have a unique shape so other bars will not fit properly.
    view full answer...
  • Will Yakima Mighty Mount 39H Fit Yakima Jetstream, Thule WingBar & Rhino-Rack Vortex Crossbars
    You'll want to go with the 39H as the 23H is for narrower bars. The 39H will fit 3-1/8" wide x 1" tall crossbars like you said, so they WILL work with the Yakima Jetstream and Thule WingBar crossbars, because both of those crossbars are 3-1/8" wide x 1" tall. They will NOT work with the Rhino-Rack Vortex crossbars though as they are too tall, measuring 3-1/8" wide x 1-3/16" tall. So for the Jetstream and WingBar here is the part number for the 39H: - Mighty Mount 39H Accessory Adapter...
    view full answer...
  • Will the Thule Compass Kayak and SUP Carrier Work with Yakima CoreBar Crossbars
    The Mighty Mount 39H Accessory Adapter part # Y03539 is designed to allow for rooftop mounted accessories that use round or square crossbars to be used with the Yakima CoreBar and JetStream aero crossbars. The Thule Compass Kayak and SUP Carrier part # TH890000 is not designed specifically for round or square crossbars as it will fit aero crossbars too just like the Yakima CoreBar. Therefore, the Mighty Mount 39H Accessory Adapter should not be needed to fit the Thule Compass Kayak and...
    view full answer...
  • Replacement Mounting Hardware for a Yakima Rooftop Cargo Case
    This will depend on the specific model of Yakima cargo box and crossbars you have. If you have a Skybox or Rocketbox branded model, you'll need to figure out which model you have. If you have a RocketBox Y07191, Y07192, or Y07193, you'll need part # Y8870097. This will replace each mounting clamp individually. This clamp is compatible with most crossbars on the market. If you have a SkyBox, or your carrier is a Rocketbox 16 model, you'll need part # Y90135. This will replace each mounting...
    view full answer...
  • Thule Roof Rack Adapter fro AeroBlade Crossbars
    If you do not want to use the Yakima Universal Mighty Mount kit # Y03590 on your Thule AeroBlade cross bars the Mighty Mount 39H # Y03539 accessory adapter will do the trick. These fit the same dimensions as the Thule aero-style crossbars and sit at a lower profile so your carrier(s) won't be too tall for your roof rack application.
    view full answer...
  • Yakima High Roller Aero Bar Adapter
    The adapter to change from a square bar to an aero bar on the High Roller is the Mighty Mount 39H Accessory Adapter part # Y03539. This will fit the original bolt and allow you to attach to your roof rack.
    view full answer...
  • MightyMount Recommendation to Install Yakima High Roller on 2015 Subaru Outback Factory Crossbars
    I checked with Yakima and for your 2015 Subaru Outback with factory crossbars the recommended Yakima MightyMount needed to install the High Roller is the part # Y03539 that you referenced.
    view full answer...
  • Dimensions of Yakima MightyMounts 39H and Fitment to Mopar Roof Bars
    I was able to go out to our warehouse and measure the Yakima 39H adapter # Y03539 for you. This adapter will fit around crossbars that measure 1 inch tall by 2-3/4 inches wide. If your Mopar bars are within these measurements then these adapters could work for you. If you could tell me the year, make, model and the dimensions of your crossbars; I would be more than happy to help you find a roof bike rack that can accommodate your needs. I have linked a couple pictures of the adapter's...
    view full answer...
    Image 1 for Image 2 for
  • Will Yakima Y07012 MightyMount Fit Thule WingBar Evo Crossbars
    The # Y03539 MightyMount 39H fits crossbars up to 3-1/8 inch wide by 1 inch tall, so they'll just fit your 3-1/8 inch wide by 1 inch tall WingBar Evo crossbars. Per Yakima, the # Y03539 Mighty Mount is compatible with the Y07012 BasketCase roof mounted cargo basket.
    view full answer...
  • Compatible MightyMount Adapter for Rola Sport Crossbars and Yakima Mako Saddles
    The Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars # Y03539 will work with your Rola Sport Roof Rack 59786 because the crossbars are the same dimensions. This will allow you to mount your Yakima Mako Saddles.
    view full answer...
  • Similar Bike Rack to Yakima KingCobra that Can Fit Overhaul HD Rack
    Your older style KingCobra bike rack can't be adapted to fit the T-slots of newer bars or fit around the Overhaul HD # Y01151-58 setup that fits your 2001 Chevy Silverado so you'd need to go with a new rack similar to it like the HighRoad part # Y75FR. This rack holds the bike by the wheel like the KingCobra but can fit into the top channels of the Overhaul.
    view full answer...
  • Compatibility of Yakima Mighty Mounts with Rola APE Roof Rack Crossbars
    According to Yakima, the # Y03539 39H Mighty Mounts are compatible with their CoreBar or JetStream crossbars. The JetStream and the Rola APE crossbars share the same 3-1/8 x 1 inch dimensions, so the 39H Mighty Mounts will work perfectly.
    view full answer...
  • Will the Mighty Mount 39H # Y03539 Allow Me to Fit My Yakima Mako to My OEM BMW Crossbars?
    I have a great alternative for you. Even though the Mighty Mount 39H Accessory Adapter # Y03539 technically works with the older Mako saddles, Yakima recommends you use the Universal MightyMounts for Yakima Roof Mounted Accessories # Y03590. There are a couple of reasons for this. Firstly, the Universal MightyMounts comes with "A" and "B" bails that will give you a better fitting option with your factory crossbars on your 2014 BMW X3. The second reason is that the Universal MightyMounts...
    view full answer...
  • Will Yakima King Cobra Bike Rack Fit Yakima JetStream Crossbars
    That's a good question so I checked with Yakima about how to mount your King Cobra bike rack to your new Yakima JetStream Crossbars # Y00425. What I found out was that there is no way for the King Cobra to use the T-slots in the crossbars, which means if you want to use this rack you will need MightyMounts, and the correct part is the Mighty Mount 39H Accessory Adapter for Yakima CoreBar and JetStream Crossbars # Y03539.
    view full answer...
  • Yakima MightyMounts that Will Fit on Thule AeroBlade Roof Rack Crossbars
    Yakima Mighty Mount 39H # Y03539 are designed specifically for Yakima Core and JetStream crossbars. For the Thule AeroBlade crossbars the best option is the universal MightyMounts # Y03590.
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
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Employee Jameson C
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Jameson C
Employee Adam R
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Adam R
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
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Employee Daron K
Written by:
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Employee Andy C
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