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Fat Bike Adapter Kit for Curt Platform Bike Racks

Fat Bike Adapter Kit for Curt Platform Bike Racks

Item # C18091
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C18091 - Wheel Adapters Curt Accessories and Parts
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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. Call 800-298-8924 to order Curt accessories and parts part number C18091 or order online at etrailer.com. Free expert support on all Curt products. Guaranteed Lowest Price and Fastest Shipping for Fat Bike Adapter Kit for Curt Platform Bike Racks. Accessories and Parts reviews from real customers.
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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..


Ask the Experts about this Curt Accessories and Parts

  • 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...
    view full answer...
  • Fat Tire Wheel Hoops Compatible with 1-1/4 Inch Support Platform Bike Racks
    The Reese Q-Slot Platform-Style 2 Bike and 4 Bike Rack for 2" Hitches # 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...
  • 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...
  • 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...
  • 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...
    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...
  • 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...
  • USA Made Expandable Platform Bike Rack Recommendation for Fat Bikes
    You can use the Curt fat tire adapter part # C18091 on the Pro Series bike rack part # PS63138 to accomodate a fat bike like you have. For an expandable 2 bike to 4 bike rack this is a great option. Now for a USA made option the best option is the Thule T2 part # TH9034XT-9036XT which is expandable and designed for fat tire bikes as well. This rack only will touch your bikes at the tires too which means it will protect any delicate frame materials or finishes. I attached a review video...
    view full answer...

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Info for this part was:

Edited by:
Lindsey S
Video Edited:
Dustin K
Written by:
Chelsea B
Installed by:
Hayden R
Updated by:
Kristina F
Updated by:
Isabelle B

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