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

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

Part Number: Y03539
38 Reviews | 33 Questions
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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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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





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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:

Ratings & Reviews

4.7

38 reviews
5 Stars
(32)
4 Stars
(3)
3 Stars
(0)
2 Stars
(2)
1 Star
(1)
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by:
needed some parts for a frankenstein set up on my Yakima rack. Need to secure the wheels on a burley bark ranger to ride above my tonneau cover. Thes are 2 of the 3 parts I needed. Fortunately I found some old school wheel trays on marketplace to finish the clean project!
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!
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by:
Great product. Super fast shipping and delivery
by:
These work well to use older round bar accessories with newer aero bars. Only complaint is the price which is set by Yakima so not an etrailer issue. These should be no more than $[XX]. In fact Yakima has replacements for $[XX]/each on their website but are “out of stock” proving that current price is ridiculous. At $[XX]+, just fells like Yakima is trying to gouge customers for simple plastic parts.
by:
The Mighty Mount 39H worked just as I needed it to. The installation was simple and allows me to have a Kick Ass shower room mounted to the crossbars, and it hangs off the side of my truck.
by:
Great customer service . Great place to buy racks and hitches
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by:
They don't work with overland truck racks. Waste of money.
Heather A. profile picture
Etrailer Expert

Heather A.

6/2/2025

That really stinks John.. how thick are the bars on your rack?

John profile picture

John

6/2/2025

@HeatherA , About 2 7/8 wide, and 1 1/2 thick
by:
Just what I need!Item description was on spot, eTrailer definitely takes their time to make the page user-friendly, simple and easy-to-use.
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:
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 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:
Works great to fit our 2016 Town and Country roof top bars to my hilly rollers kayak carrier!
by:
Shipping was extremely quick and packaged well. Product works great on crossbars.
by:
Easy, solid conversion that allows us to continue using all of our old carriers on our new rack. Perfect for kayak cradles.
by:
It was a struggle getting (Global parts shortage) these but the Etrailer team made it happen..
by:
Thank you Adam E for the excellent communications. Great transaction with fast shipping.
by:
Looking forward to using these with my high roller bike rack. :)
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:
Excellent shipping and tracking coordination. Product delivered as represented and performs as expected.
by:
by:
Fast and accurate.
by:
Yakima products are Great.
by:
Great service; order arrived 5 days before expected delivery date.
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Info for this part was:

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