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Extension for Curt Roof Mounted Cargo Basket - 21" Long

Extension for Curt Roof Mounted Cargo Basket - 21" Long

Item # C18117
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Add onto your Curt roof-mounted cargo basket (C18115) with this 21" long extension. 1-636-306-4830 to order CURT accessories and parts part number C18117 or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Extension for Curt Roof Mounted Cargo Basket - 21" Long. Accessories and Parts reviews from real customers.
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  • Reviews (19)
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CURT Accessories and Parts - C18117

  • Roof Basket
  • Extensions
  • CURT

Add onto your Curt roof-mounted cargo basket (C18115) with this 21" long extension.


  • Extends length of cargo carrier by 21" to make overall basket dimensions 62-1/2" long x 37" wide x 4" deep
  • Fits Curt roof-mounted cargo basket (C18115)
    • Inserts between the 2 main pieces of the carrier - slides onto and into bars

18117 Curt Rooftop Cargo Carrier Extension

Installation Details C18117 Installation instructions

Video of Extension for Curt Roof Mounted Cargo Basket - 21" Long

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

Video Transcript for Curt Extension for Roof Mounted Cargo Basket Review

Matt: Hey guys Matt here at Today were going to be taking a quick look at the Curt 21 Inch extension piece for the Curt Rooftop Cargo Basket, part number C18117. Now this extension piece will give you an additional 21 inches to your existing Curt Rooftop Cargo Basket. You can see its made of the same heavy duty, strong steel construction. It has that nice black powder-coat finish to help resist rust and corrosion. It also comes with the hardware and tools so that you can install it directly to your existing Curt Rooftop Cargo Basket. Now one thing to keep in mind when purchasing this extension you want to make sure that the roof or basically how youre vehicle is engineered so that youre going to have enough space. For example here we had to push the basket a little bit farther close to the front just to make sure that we can get access to the rear hatch.

Now it is kind of close on this vehicle so again just something to really keep in mind when youre deciding to purchase this extension. So with the extension the overall basket dimensions are going to be 62-1/2 inches long by 37 inches wide by 4 inches deep. Now well go ahead and load up some gear and take it out on the road. Now with our gear all loaded up well be using the 65 inch by 38 inch Curt stretchable cargo net to secure our gear in place. This is part number C18201. Now with our gear all secured we can go ahead and take it out on the road. That will complete todays review of the Curt Roof Mounted Cargo Basket Extension, part number C18117.


Customer Reviews

Extension for Curt Roof Mounted Cargo Basket - 21" Long - C18117

Average Customer Rating:  4.7 out of 5 stars   (19 Customer Reviews)

Add onto your Curt roof-mounted cargo basket (C18115) with this 21" long extension.


This really increases the carrier capacity (size, not weight) and now accepts my carry bags without them hanging over the edges.

The basket and extension are fantastic. Have used it multiple times. Great product. A little wind noise when empty going down the road. Other than that, no complaints.
David H - 06/22/2022


I have bought the Curt Roof mount cargo basket 2 weeks prior to a trip, so we could carry more to and not be so cramped in my Subaru Forester. However, the original one I bought seems a little small. So I bought this extender for it, and it worked out great. they shipped it immediately, and delivery was very fast. Easy to assemble and would recommend to anyone who has a shorter basket.


I bought the Curt roof top basket and mounted it to my 13 JK. I wanted it lower than the offered brackets would allow so I made my own mounting kit. I worked great and looks much better low to the roof.


Loved the price and the look. I had a very difficult time tightens the attachment brackets that connect the carrier to the roof. The lock nuts on two of them were extremely hard to tighten. I had to use vice grips on two of them. One of the plastic pieces broke that cover the lock nut.


A real bargain to extend your storage basket.

Pretty good. A few minor rust spots that need touching up with paint, but then again, I drive this on the salt water beach all summer.
Hal - 06/14/2017


The product itself is great.

hardware (machine screws), as noted in many reviews, are sub-par and the heads strip very easily with the tool provided.

The manufacturer is likely aware of this ongoing issue and should address it by utilizing stainless steel screws/hardware for durability and rust prevention...I had to spend an additional $10 to bring it up to par...

So this is not at all an issue for etrailer, as you delivered as promised and at a great price!

One year later and still going strong! Having replaced the screws as mentioned in my initial review, the cargo rack is easily converted to the longer rack when used on my larger vehicle. No rust and strong, this rack is a worthwhile investment.
Drew - 06/27/2020


This extension really looks great with the core basket. Great quality. Simple installation.


great guilty looks great & well built very happy with it


Shipped with the complete rack that I'm wondering if these parts aren't stolen! Ordered another part from a jeep company and their product hasn't even shipped yet. Etrailer even called me when there was a small issue with my credit card; their customer service representative was fantastic and went above and beyond is making sure was my order was processed and would ship as ordered. Product is top notch and better than some car roof racks I've seen a jeep functions.


The unit is nice and dose it's job. Unfortunately you do have to force it to line up.


Cargo basket is top notch! Looks great on my Jeep Cherokee, and is tough enough to survive the brutal North Dakota winters.


Very happy with this product. The extension was very easy to install. Looks great on my Ford Transit Connect. Very fast delivery and great customer service. Great price for a great product.


Awesome job !!!!!! Best service again ! !!!!



well built , just what I needed.




Basket extension works great and etrailer delivered quickly.



See what our Experts say about this CURT Accessories and Parts

  • Will Using the Extension with a Curt Cargo Basket Increase its Weight Capacity
    Adding the extension # C18117 to your Curt cargo basket will not increase the weight capacity. It does not decrease it either. The weight capacity will stay the same. Please be sure to consult the vehicle owner's manual and/or the vehicle manufacturer for the roof weight carrying capacity. There are several components that have weight capacities, the basket is one, the roof rack is another, and the vehicle roof is the third. You will need to go by whichever one has the lowest capacity.
    view full answer...
  • 2012 Jeep Grand Cherokee with OEM Crossbars Roof Cargo Basket and Extension Recommendation
    The Curt # C18115 Roof Mounted Cargo Basket will fit crossbars that are up to 3 inches wide. This cargo basket is designed to fit most factory and aftermarket roof racks, but please measure your Aero crossbars to make sure that this cargo basket will work with them. Curt does indicate that the crossbars have to be spaced at least 15 inches apart to mount this basket. Please make sure that you check your owners manual to verify the roof and crossbar weight capacities. You want to make...
    view full answer...
  • Will the Curt Roof Mount Cargo Basket Fit a 2013 Toyota RAV4 with Factory Roof Rack
    You will not need to add an aftermarket roof rack to your 2013 Toyota RAV4 since it already has a factory roof rack with crossbars. You will need to measure the crossbars though to determine if the Curt cargo basket # C18115 will fit. Measure how thick or wide the bars are. If they are under 3 inches wide then the mounting hardware for the basket will fit. Next measure the bar spread by measuring from the center of the front bar to the center of the rear bar. That distance will need to...
    view full answer...
  • Can 2 Extensions be Added to Curt Roof Mount Cargo Basket
    On the Curt roof mount cargo basket # C18115 you could use 2 extensions, # C18117. This would make the basket 83-1/2 inches long. Because of the length I strongly reocmmend adding a third roof rack bar for extra support. Even if you used some foam blocks or something similar, extra support is likely going to be needed.
    view full answer...
  • Curt Roof Cargo Carrier # C18115 Compatibility with a 2006 Acura MDX
    The crossbars on your 2006 Acura MDX should will have to be at least 15 inches apart. Since you have crossbar spacing of 27 inches, this cargo carrier should work very well for you. If you had even wider crossbars or wanted more cargo space, you could install a Extension for Curt Roof Mounted Cargo Basket, part # C18117. I included installation instructions for both of these products below for you to check out.
    view full answer...
  • Product Weight of Curt Roof Top Cargo Basket # C18115 and Cargo Basket Extension # C18117
    The weight of the Curt Cargo Carrier # C18115 is 29.1lbs while the extension # C18117 weighs in at 14lbs. That's a combined total of 43.1lbs. I have linked both products to this page for your purchasing convenience.
    view full answer...
  • Does Roof Basket Have an Extension?
    There are similar baskets with extensions available, but none that will work with the Reese or Rola Roof Cargo Basket . Instead, I recommend checking out the Curt Roof Mounted Cargo Basket # C18115 and adding Extension # C18117. This is a 21" extension which will make the Curt basket a total of 61-1/2" long x 37" wide x 4" deep. The Curt basket will fit on most roof racks so long as the bars are spaced 15", 22", or 29" apart on center and have dimensions of up to 3" wide x 1-5/8" tall.
    view full answer...
  • Extension for Curt Roof Mounted Cargo Basket
    There is an extension for the Curt Roof Mounted Cargo Basket # C18115; what you need is Extension for Curt Roof Mounted Cargo Basket # C18117. This is a 21" extension that inserts directly in the middle of the basket and will make the basket a total of 62-1/2" long x 37" wide x 4" deep.
    view full answer...
  • Roof Cargo Basket with Available Extension
    For the Curt roof basket, # C18115, there is an extension available. It is part # C18117. This makes the carrier about 21 inches longer. I have linked a video that features both the basket and the extension.
    view full answer...
  • Is the Curt Roof Mounted Cargo Basket Compatible with Yakima CoreBar Crossbars
    I am happy to inform you that the Curt Roof Mounted Cargo Basket, part # C18115, will fit the Yakima CoreBar crossbars. If you need the basket extension, we have that here. It's part # C18117 and it adds 21" in length. I've linked to a video review of it below.
    view full answer...
  • What Roof Mounted Cargo Carrier Does the Extension for Curt Roof Mounted Cargo Basket Fit
    The Extension for Curt Roof Mounted Cargo Basket # C18117 is the correct extension for the Curt Roof Mounted Cargo Basket # C18115. The Extension for Curt Roof Mounted Cargo Basket # C18117 extends the length of the cargo carrier by 21" to make the overall basket dimensions 62-1/2" long x 37" wide x 4" deep. I am not sure what roof cargo basket (roof rack) that you have, if you can provide me with the manufacturer and model/part number of your current rack then I would be happy to help...
    view full answer...
  • Will Curt Roof Cargo Carrier # C18115 Fit On 2008 Nissan Pathfinder LE With Factory Roof Rack
    As long as the crossbars on your 2008 Nissan Pathfinder LE are spaced at least 15 inches apart and the crossbars are 3 inches wide or less, the Curt Roof Cargo Carrier # C18115 should fit your vehicle with no problem. The assembly is quick and easy and the carrier comes with a fairing that will reduce wind noise and drag. I have included a link to the installation instructions for this item. If you need extra room, you might be interested in the Curt Basket Extension # C18117. This item,...
    view full answer...
  • Will the Curt Cargo Basket Fit on a 2011 Nissan Armada Platinum with the Factory Roof Rack
    As long as the crossbars on your 2011 Nissan Armada Platinum are no wider than 3 inches, then the Curt Cargo Basket, # C18115, and the extension, # C18117, will fit. As a side note, this cargo basket requires a minimum crossbar spread of 15 inches, which should not be a problem on your vehicle. Also, the weight capacity of the cargo carrier remains at 150 lbs when the extension is added. Before loading any cargo on your roof, I recommend checking your owners manual to verify the weight...
    view full answer...
  • Availability of Extension for MaxxTow Roof Mounted Cargo Basket
    There is not an extension available for the MaxxTow Roof Mounted Cargo Basket MT70115 that you referenced. We do have other cargo baskets like the Curt # C18115 that can be extended with the add-on piece # C18117, but unfortunately this isn't possible with your existing unit. If you are needing a little more space for cargo another option is a hitch-mounted cargo carrier like the Curt # C18145 if you have a trailer hitch installed on your vehicle. If you don't yet have a trailer hitch...
    view full answer...
  • Will Spare Tire Carrier for Yakima Roof Rack Cargo Baskets # Y07076 Fit Curt Cargo Basket # C18115
    It should work, the dimensions are a little bit different but they should be close enough to make it work. The Spare Tire Carrier for Yakima Roof Rack Cargo Baskets # Y07076 that you referenced is designed to fit cargo baskets with 1/2 in diameter cross tubes that are spaced 3-11/16 inches apart measured on center. The Curt Roof Basket part # C18115 that you referenced has 1/2 diameter tubes that are spaced 3-1/2 inches apart. That's a difference of a little under .2 of an inch in spacing...
    view full answer...
  • Will Yakima Spare Tire Carrier for Roof Baskets Fit a Curt Basket on a 2008 Ford Escape
    The Yakima spare tire carrier # Y07076 will fit a Curt cargo basket # C18115 but it holds the tire in the confines of the basket. So if the basket you have is not wide or long enough for the spare tire on your 2008 Ford Escape then you would need either a different basket or the extension for the Curt basket, # C18117. If your Escape has the standard 235/70-16 tires then those are roughly 29 inches in diameter so there should not be a problem fitting in the Curt 41.5 x 37 inch basket.
    view full answer...
  • Compatibility of Curt # C18115 Roof Rack with 2006 Toyota 4Runner With Roof Rails
    The Curt Roof Mounted Cargo Basket # C18115 plus the # C18117 extension won't attach directly to the side rails on the roof of your 2006 Toyota 4 Runner. The basket needs roof rack crossbars to provide an attachment point. SportRack offers a reasonably priced crossbar kit that would work perfectly for you, part # SR1098. Once the crossbars are installed, you can adjust the bar spread (spacing between the two crossbars) wherever you need to in order to install the roof basket.. As you can...
    view full answer...
  • Is Extension Piece for Curt Cargo Basket # C18115-117 Included or Separate
    The extension piece that comes with the Curt basket part # C18115-117 is included, but if you needed it separately it would be part # C18117. Basically the part # C18115-117 is just the part # C18115 and the part # C18117.
    view full answer...
  • Inside Dimensions of Extension for Curt Roof Mounted Cargo Basket
    The Extension for Curt Roof Mounted Cargo Basket # C18117 is 37" wide and 4" deep measured from the inside of the bars. It's 39-1/4 inches wide on the outside of the bars. It lets you add on to your Curt Roof Mounted Cargo Basket # C18115 for 21 more inches of carrying space. There is a kit available with the extension # C18117 and the basket # C18115 together, the Curt Roof Mounted Cargo Basket # C18115-117. I linked the baskets and extension, as well as a few review videos for reference.
    view full answer...
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  • Will the Extension for Curt Roof Mounted Cargo Basket Fit Other Roof Baskets
    The Extension for Curt Roof Mounted Cargo Basket part # C18117 as the title states is for the Curt Roof Mounted Cargo Basket part # C18115. Therefore, I cannot confirm it will work with your Haul Master Roof Mounted Cargo Basket. I would be happy to try this out for you but we don't carry Haul Master products either. The best option we can offer you if you need more space is to sell your Haul Master Roof Mounted Cargo Basket and then obtain the Curt Roof Mounted Cargo Basket part # C18115-117...
    view full answer...
  • Low Profile Light Bar and Cargo Basket for a 2013 Jeep Wrangler Unlimited
    Cargo baskets like # C18117 are going to require some sort of roof rack crossbars to mount to your 2013 Jeep Wrangler Unlimited but I have a different recommendation you might like. First, since you want to mount lights on the Jeep I recommend using the Carr XRS Rota light mounting bar # CARR210221. This light bar will eliminate clearance concerns and create a low-profile look by rotating the bar down, even with lights mounted. And there is no drilling required for installation. For lights...
    view full answer...
  • Will Curt Extension fit Yakima LoadWarrior Cargo Basket
    While there is an extension that will fit the Yakima LoadWarrior Roof Rack Cargo Basket # Y07070 the Curt Extension # C18117 will not fit. Instead you will need the Extension for Yakima LoadWarrior Roof Rack Cargo Basket # Y07074.
    view full answer...
  • How Heavy is the Curt Roof Mounted Cargo Basket?
    When you combine the base Curt Roof Mounted Cargo Basket # C18115 with the 21" extension piece # C18117, then you have the Curt Roof Mounted Cargo Basket that is 66-1/2" Long x 37" Wide x 4" Deep # C18115-117. The weight of this cargo basket is 29 lbs plus 14 lbs for a total of 43 lbs. We also have other accessories that you might find useful with this cargo basket like the Curt stretchable cargo net # C18201 which is custom fit to stretch across your expanded cargo basket and will help...
    view full answer...
  • What is a Waterproof Storage Solution for a Roof Cargo Basket?
    It is absolutely fine to leave a roof cargo basket on when it is not in use. This adds a rugged style to the vehicle and means that you will not need to find space inside your home or garage to store the rack between trips. A recommended setup for a cargo basket on a 2016 Jeep Renegade is the Malone AirFlow2 Roof Rack, part # MPG216 combined with the Curt Roof Mounted Basket, part # C18115. This provides additional cargo space and is expandable with the Cargo Basket Extender, part # C18117...
    view full answer...

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