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Fat Bike Adapter Kit for Curt Platform Bike Racks

Fat Bike Adapter Kit for Curt Platform Bike Racks

Item # C18091
Our Price: $50.83
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Swap out the wheel holders on your Curt platform-style bike rack (C18084 or C18086) with these larger hoops so that you can carry 1 fat tire bike. Fits tires up to 4-7/8" wide. Holders tighten with hand knobs - no tools or extra hardware needed. 1-636-306-4830 to order CURT accessories and parts part number C18091 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Fat Bike Adapter Kit for Curt Platform Bike Racks. Accessories and Parts reviews from real customers.
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  • Reviews (39)
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  • Videos (2)
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CURT Accessories and Parts - C18091

  • Hitch Bike Racks
  • Wheel Adapters
  • CURT

Swap out the wheel holders on your Curt platform-style bike rack (C18084 or C18086) with these larger hoops so that you can carry 1 fat tire bike. Fits tires up to 4-7/8" wide. Holders tighten with hand knobs - no tools or extra hardware needed.


  • Adapter kit kets you carry 1 bicycle with fat tires on your Curt 2-bike (C18084) or 4-bike (C18086) platform-style bike rack
  • Replaces 1 front wheel holder and 1 rear wheel holder on your rack
  • Sliding wheel holders accomodate bikes of different lengths
    • Wheel holders slide along horizontal arm and secure with knobs
  • Easy installation with no extra hardware required
  • Rust-resistant, black powder coated steel construction
  • Fits tires up to 4-7/8" wide
  • Assembled in the USA

18091 Curt Tray Style Bike Rack Hoops for Fat Tires

Video of Fat Bike Adapter Kit for Curt Platform Bike Racks

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

Video Transcript for Curt Platform Bike Rack Fat Bike Adapter Kit Review

Today, we're going to be taking a look at the Fat Bike Adapter Kit for Curt platform bike racks, part number C18091. This kit is going to allow you to take your Curt two or four platform style bike rack and adapt it to carry fat tire bikes. It comes with two cradles that will carry a tire up to 4 7/8 inches wide. It's going to replace your existing cradles, but hang on to these because you can easily swap them when not carry fat tire bikes. It has the same finish and style as our existing bike rack, so it's going to fit in seamlessly. Now that we've got all the features, I'll go ahead and show you how easy these are to get installed.

Now, you're going to get two cradles per kit. You want to be sure and pick up one kit for each fat tire bike you have. First thing we can do is go ahead and loosen up our standard bike cradle. We're going to slide that off, then we'll take our fat bike cradle, be sure that it's loosened up, then we'll slide it on to however the size of our wheelbase is, and then tighten it up. For the opposite side, it's not a bad idea to stagger your cradles. That way, one set of cradles is not trapped on the inside.

Now, loading up our fat tire bike is just as easy as loading up a regular bike. We'll just set it in the cradles and then lower down our center hook. Great. Now, we can just load the rest of our bikes the way we normally would. That's going to complete our look at the Curt Fat Bike Adapter Kit for Curt platform bike racks, part number C18091..

Customer Satisfaction Score:

Customer Reviews

Fat Bike Adapter Kit for Curt Platform Bike Racks - C18091

Average Customer Rating:  4.6 out of 5 stars   (39 Customer Reviews)

Swap out the wheel holders on your Curt platform-style bike rack (C18084 or C18086) with these larger hoops so that you can carry 1 fat tire bike. Fits tires up to 4-7/8" wide. Holders tighten with hand knobs - no tools or extra hardware needed.


I got these to use on my swagman rack, and they fit OK, but are loose fitting. I was able to get them to fit tight by using 1/16 inch flat metal as shims. However, the hoops have a plastic sleeve so it is not a solid connection and have some give with the weight of 2 bikes on them. I suspect this would be true if they are used on a curt rack also. One of the hoops is welded at not a perfect 90 degree angle, so it droops a little.

Actually, the wheel hoops dont need to be super-locked down tight. As long as theyre snug enough to stay in place, youll be good to go.
-- comment by: Mike L - 08/22/2022


This is not the item I ordered. The hoops are 3 inches wide.The item I ordered was hoops four and seven eighth inch wide to fit a fat tire bike. I'm very disappointed

Customer Service will reach out to you.
-- Etrailer Expert Sierra K - 12/20/2021


Worked on a HOLLYWOOD bike rack perfectly. E trailer did good again


They worked great for my fat tire bikes,


This item fit my bike carrier, now I can carry both style bikes at the same time. Standard size tire bikes and fat tire bikes (electric Rad Rover) Recommend that you check this item out.


Needed replacement tire loops for the 4" wide fat tire bike. The Hollywood bike carrier I had only worked on the 2" width tires. Now have option for both widths of bike tire. Very easy to install and works great!


I originally purchased my trailer hitch bike rack that handles standard size tire bikes. Recently I purchased a fat bike and my rack would not accommodate the large tires. Enter Etrailer, they sell fat tire rack adapters that slide right on my bike rack. That saved me from buying a new bike rack.


Works great on my Xport rack 1 1/4 inch.


Perfect fit for my existing bike rack. I would recommend a velcro strap for securing the bike wheel to the adapter.


The hole is two large for my bars but I can adapt them I am sure by putting tape around my bars.


Worked out great for my 4.8” tires


Great products.


Fits any 1 1/4" square tube bike carrier to include the numerous china imports and the Swagman XTC2


Our 4" fat bikes fit well and we can now take them on our bike rack. Great product and super helpful customer service!


Fits perfect on my rack and my electric Ebike fits perfect to haul.


Works great with my RadRunner fat tire e-bike


Fits bike tire well. Fast Delivery!


Just what I needed for my New 4" Tire E Bike, PERFECT! Sorry No pictures just yet.


Does what i needed it to do which was carry around my rad rover 5 fat tire :) thanks!!!


Great improvement to my Vibretti rack.


Just what we needed for our E bikes


I was so pleased with the help I got from this young lady she is a wonderful asset to the company


It is exact ally what I want and needed .thank you .fit perfect


Fantastic Transaction, outstanding communication. I will definitely order from you again next time !


Fit perfectly does what it is supposed to do

Show More Reviews

See what our Experts say about this CURT Accessories and Parts

  • Fat Tire Wheel Hoops Compatible with 1-1/4 Inch Support Platform Bike Racks
    The Reese Q-Slot PS63138 has a bar that is 1-1/4 inches. The Fat Bike Adapter Kit for Curt Platform Bike Racks # C18091 will fit this carrier well. I went out to the warehouse to confirm the fit for you.
    view full answer...
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  • What is the Square Opening Size of the Curt Fat Tire Wheel Hoop part # C18091
    The size of the square opening of the Curt fat tire wheel hoop part # C18091 is 1-1/4 inch by 1-1/4 inch.
    view full answer...
  • Could Curt Fat Tire Adapter part # C18091 Fit Swagman XTC4
    The Curt fat tire adapter part # C18091 would fit the Swagman XTC4 # S64665 since it is designed to fit the same size square tube.
    view full answer...
  • Is The Curt 2 Bike Platform Rack Compatible With 27.5+ MTB Tires?
    The Curt 2 Bike Platform Rack C18084 can accommodate mountain bikes with 27.5+ size tires. The wheel hoops are adjustable to fit many different bike lengths as well. The hoops are restricted to 3 inch wide tires, but there is an adapter kit for fat bikes # C18091. I recommend using the Locking Hand Knobs for Curt 2 Bike Platform Rack - Qty 2 # C18090 with this rack to secure your bikes.
    view full answer...
  • What is Largest Tire Diameter Curt Platform Bike Rack Can Accomodate
    The maximum tire width the Curt bike rack part # C18085 can accomodate is 3 inches. The fat tire adapter for this rack is part # C18091 which can accomodate a tire up to 4-7/8 inches in width.
    view full answer...
  • Correct Fat Tire Adapter for Curt 4 Bike Platform Rack
    Yes, the Fat Bike Adapter Kit for Curt Platform Bike Racks part # C18091 will fit the Curt 4 Bike Platform Rack part # C18087.
    view full answer...
  • Fat Bike Adapter Kit For The Reese Q-Series Platform Bike Rack
    The Fat Bike Adapter Kit for Hollywood Racks Sport Rider E-Bike Rack # HRSPRWH-F-HD that you mentioned are actually only designed to fit the Hollywood Racks Sport Rider Bike Racks, and is not compatible with your Reese Q-Slot Platform-Style 2 Bike and 4 Bike Rack for 2" Hitches # PS63138 which is no longer offered. Instead, I recommend taking a look at the: -Fat Bike Adapter Kit for Curt Platform Bike Racks # C18091. This fat bike adapter will fit your Q-series bike rack as the bar this...
    view full answer...
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  • Maximum Tire Width for Curt 2 Bike Platform Rack
    The Curt 2 Bike Platform Rack # C18085 is compatible with tires up to 3" wide. Anything wider than that and you need the Fat Bike Adapter Kit # C18091 which can accommodate tires up to 4-7/8" wide. If you don't already have the bike rack and you know you need the Fat Bike Adapter Kit then you can actually purchase the bike rack # C18085-FB which is the exact same bike rack, just with the adapter kit already installed.
    view full answer...
  • Recommended Fat Bike Tire Adapter Kit for MaxxHaul Bike Rack
    It is possible that the Fat Bike Adapter Kit for Curt Platform Bike Racks # C18091 will fit but I cannot say for sure since we do not carry MaxxHaul bike racks. I am assuming you are talking about the MaxxHaul 50027. The Swagman Fat Bike Tire Wheel Adapter for XTC 2/XTC - 2 Tires # S64674 looks like a similar design, but just like the Curt I cannot confirm if it will fit. I recommend reaching out to MaxxHaul to see if they have any information about kits from other brands fitting their...
    view full answer...
  • Fat Bike Adapter Kit for Swagman XC 2-Bike Rack
    I do have a solution for you, but the Fat Bike Adapter Kit for Curt Platform Bike Racks Item # C18091 will not fit on your Swagman XC 2-Bike Platform Rack # S64650. Instead, why not use Swagman's very own Fat Bike Adapter # S64674? This is labelled as for Swagman's XTC bike racks, but I can confirm that they will also work on your Swagman XC bike rack # S64650 and it fits tires up to 5" wide. I see you have one bike mounted, but just a head's up for when you want to mount two it that you...
    view full answer...
  • Will Curt Fat Tire Adapter Kit Fit Swagman Chinook Bike Rack
    Yes, the Swagman Chinook Bike Rack # S64683 is compatible with the Fat Bike Adapter Kit for Curt Platform Bike Racks # C18091. The # C18091 has a 1-1/4 inch square tube opening, which is correct for the Chinook, which is why it will fit. That said, I did want to mention that there is a kit made for the Chinook that is better due to the fact it has better wheel holders compared to the hoops of the Curt, and that's the Fat Bike Adapter Kit for Swagman Quad 2+2, Dispatch, and Chinook Bike...
    view full answer...
  • Can I Use The Curt Fat Tire Trays With The Hollywood Racks Sport Rider SE Bike Rack?
    The Curt Fat Tire Adapters # C18091 may fit on the Hollywood Rack # HR1400Z as they both use a 1 inch by 1 inch square tube, but I highly suggest not doing that. I never recommend swapping parts from different bike racks as it could change the bike spread and simply not have the best fit which will cause some shaking whenever you're driving. Here are the cradles designed for the Hollywood Racks Sport Rider SE # HRSPRWH-F-HD. If you haven't bought the bike rack already, I would recommend...
    view full answer...
  • Carrying Two Fat Bikes with the Curt 2 Bike Platform Rack with Adapters
    If the Curt 2 Bike Platform Rack, part # C18085 can carry two fat bikes will be determined by the weight of the bikes. Each position is limited to 45 pounds, and the individual bikes in this position can't exceed this weight capacity, even with the fat bike adapters, part # C18091 equipped onto the rack. If you're buying for two fat bikes, you can save a little bit by buying the dual Fat Bike kit, part # C18085-FB. If you have heavier fat bikes, and this rack won't work for you, I recommend...
    view full answer...
  • Comparing Hollywood Racks Sport Rider and Curt 4-Bike Racks
    The Curt 4-Bike Platform Rack # C18087 is a fine entry-level type option for a bike rack, but when it comes to function, durability, and convenience the clear winner is the Hollywood Racks Sport Rider SE 4-Bike Rack # HR1400Z. Starting with function and convenience, the Curt uses a threaded hitch pin that you have to deal with to secure it in the shank, while the Hollywood has a very simple handle that you turn which tightens the rack in the shank. The Hollywood is also much more durable...
    view full answer...
  • USA Made Expandable Platform Bike Rack Recommendation for Fat Bikes
    The Malone Runway 4 Bike Rack # MAL82VR can hold tires up to 3.5 inches wide and unfortunately, Malone does not make a fat tire adapter kit for the this rack. This bike rack is also not able to go from its 4-bike configuration to a 2-bike configuration, so I don't believe it's your best option. Now, for a USA made 4-bike rack the best option is the Thule T2 Pro XTR part # TH83JV with 2-bike add on # TH9036XT which can go back and forth between a 2-bike and a 4-bike rack and is designed...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Dustin K
Video Edited:
Dustin K
Employee Chelsea B
Written by:
Chelsea B
Employee Hayden R
Installed by:
Hayden R
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
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