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Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long
CURT

Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long

Part Number: C45770
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$44.81
Retail:$50.95
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Transform your 2" trailer hitch receiver (Class III only) into a 1-1/4" one with this adapter from Curt. It slides into your existing hitch receiver so you can easily carry a 1-1/4" bike rack or other hitch-mounted accessory. 1-800-940-8924 to order CURT hitch adapters part number C45770 or order online at etrailer.com. Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long. Hitch Adapters reviews from real customers.
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  • Reviews (220)
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CURT Hitch Adapters - C45770

Highlights

  • Versatile Adapter: Converts 2" Class III hitch to a 1-1/4" receiver for bike racks.
  • Compact Design: 4" length is ideal for maintaining a balanced load.
  • Strong Construction: Made from solid steel with a gloss black powder coat finish.
  • Perfect Fit: Designed for Class III hitches with a max tongue weight of 350 lbs.
  • Extended Reach: Allows accessories to clear bumper, enhancing vehicle space utility.
  • Anti-Rust Coating: Superior protection against rust, ensuring long-lasting durability.

Features to know about

Perfect Fit for Versatile Use: 2-Inch to 1-1/4-Inch Receiver Adapter

Got a bike rack or cargo carrier that just doesn’t fit your 2-inch trailer hitch? The Curt Trailer Hitch Receiver Adapter converts your spacious 2-inch Class III hitch into a snug 1-1/4-inch space. This is perfect for mounting bike racks, cargo carriers, or other hitch accessories designed for a 1-1/4-inch receiver. With this adapter, you don't need to invest in new equipment to fit your setup — it ensures a seamless transition from one receiver size to another.

Robust and Ready for Action: Strong Steel Construction

When you hear "heavy-duty," this is what we're talking about. The adapter is crafted from solid steel, offering unparalleled durability and strength for your towing needs. Its robust build ensures that it sustains pressure and use over time, so whether you're hitting the road occasionally or frequently, this adapter is up to the challenge.

Stay Ahead of the Rust Game: Gloss Black Powder Coat Finish

Rust and corrosion can spoil even the best hitch, but the Curt adapter is finished with a sleek, gloss black powder coat. This durable finish not only looks sharp but also provides superior rust resistance. Enjoy a product that’s built to withstand the elements and maintain its aesthetic appeal over time.

Perfect Fit Every Time: 4-Inch Length

Need just the right extension to clear that bumper? With a length of 4 inches from the center of one hitch pin hole to the center of the other, this adapter gives your hitch-mounted accessory the room it needs without causing a substantial change in distance from the vehicle. It's long enough to add clearance but compact enough to keep everything stable.

Built-In Safety: Maximum Tongue Weight of 350 lbs

Hitch adapters often require caution with weight limits, and this one’s no exception—but with a hefty maximum tongue weight of 350 pounds, you're good to go for most bike racks and cargo carriers. Just a heads-up: while using the adapter, the tongue weight capacity of your hitch is effectively halved, so plan your load accordingly to keep everything secure.

Versatility with a Note: Fits Class III Hitches

This adapter is specifically designed for Class III hitches, perfectly fitting a 2 x 2-inch trailer hitch receiver. It's flexible enough to accommodate a range of hitch-mounted accessories, making it a versatile must-have for those who need to tow different configurations. A quick swap and you're adapted — no fuss, just function.

Specs

Application

  • Application: 2" x 2" trailer hitch receivers
    • Fits Class III hitches only

Receiver Size

  • Receiver size: 1-1/4" x 1-1/4"

Weight and Capacity

  • Maximum tongue weight: 350 lbs

Dimensions

  • Length: 4" from center of hitch pin hole to center of hitch pin hole

Warranty

  • 1-Year limited warranty

Note

Using this adapter will reduce your hitch's weight capacity by 50 percent. Do not use this hitch adapter in towing applications or for snow plow attachments.

45770 Curt Hitch Extender for 2" Trailer Hitch Receivers - 4" Long




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Customer Reviews

Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long - C45770

Average Customer Rating:  4.8 out of 5 stars   (220 Customer Reviews)

Transform your 2" trailer hitch receiver (Class III only) into a 1-1/4" one with this adapter from Curt. It slides into your existing hitch receiver so you can easily carry a 1-1/4" bike rack or other hitch-mounted accessory.

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See what our Experts say about this CURT Hitch Adapters

  • Availability of Class II Hitch for 2021 Chevrolet Bolt EV
    The only option for a Class II hitch on your 2021 Chevy Bolt EV is the EcoHitch # 306-X7359 with a 2" receiver. Any hitch with a 1-1/4" receiver like the # 24956 is Class I. If your bike rack is Class I compatible the Draw-Tite will be the better option. More than likely it requires at least Class II if it has the capacity for two e-bikes. You can use an adapter like # C45770 with the EcoHitch but it will reduce your capacity by 50% so that isn't a good option. You may be faced with getting...
    view full answer...
  • How Can I Use a 1-1/4" Accessory on a 2-Inch Hitch for My 2022 BMW X3?
    By saying you have a 2022 BMW X3i, I assume you mean either a 2022 BMW X3 xDrive30i or the sDrive30i. You are correct that we only have 2-inch hitch receivers that are available for all models of 2022 X3. Although, there is a way to still use your 1-1/4" Class II accessory. For that route, I recommend using the Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long # C45770 along with the Curt Hitch - 2" # C13387. With the adapter, you create a compatible 1-1/4" receiver...
    view full answer...
  • Thule T2 Bike Carrier Replacement Shank
    If you have a 2 inch hitch on your 2020 Mazda CX-9 and use a hitch reducer # C45770 then this shank # 753370902 for the Thule T2 will work!
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  • Anti-Rattle Device for 2 Inch to 1-1/4 Inch Receiver Adapter Carrying Bike Rack
    Because using an adapter like the # C45770 adds another piece to the connection between the hitch receiver tube and the hitch mounted accessory (bike rack in this instance), you will tend to get some more movement than you normally would. If you were to use a Roadmaster Quiet Hitch, part # RM-061 where the adapter connects to the receiver hitch, it would prevent movement there. If your bike rack already has an anti-rattle threaded hitch pin, you won't need to do anything about the connection...
    view full answer...
  • What Hitch Adapter Allows Me to Use the 1-1/4 Inch Yakima Dr. Tray on a 2-Inch Hitch?
    I have a solution for you. If you are trying to use your 1-1/4" Yakima Dr. Tray with on a 2-inch hitch receiver, the 2" Shank Adapter for Yakima Ridgeback or FullTilt Bike Rack 8890298 unfortunately will not fit. This is because this adapter is specifically made for Rideback and Fulltilt racks manufactured before November 2015. Also, I am sorry to say that Yakima does not carry a similar 2-inch adapter for the Dr. Tray. With that being said, there is still a way to use the Dr. Tray on...
    view full answer...
  • How To Reduce Rattle When Using a 2 Inch to 1-1/4 Inch Reducer with Bike Rack
    I do have an option for you but all of the reducer sleeves like the Curt Trailer Hitch Receiver Adapter part # C45770 are going to be problematic in regards to excess slop at the connection point. However, what you can do to avoid this is use an anti-rattle device. The best anti-rattle devices we have are the Roadmaster Anti-Rattle devices which can be used for both the hitch reducer, and your 1-1/4" accessories. For the 2" side of the reducer you can use part # RM-061 and for the 1-1/4"...
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  • Do You Sell a 2-Inch Hitch Adapter for a 1-1/4 Inch Bike Rack?
    If you have a Yakima Buckhorn 4 1-1/4" bike rack (which is discontinued from Yakima), I recommend the Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long # C45770. With this adapter, you will be able to use your 1-1/4" Buckhorn on a 2-inch receiver. It is important to note that using this adapter will reduce your hitch's weight capacity by 50 percent.
    view full answer...
  • Using Yakima HoldUp EVO for 1-1/4” Hitches on a 2” Hitch Receiver
    I definitely have some options so that you can use your Yakima Hold-Up EVO Bike rack # Y02480, but the reason Yakima does not recommend using an adapter with this bike rack is because most hitch adapters reduce the weight capacity of your hitch by half. An example of that is this Curt Hitch Adapter # C45770 that not only makes your hitch smaller to fit 1-1/4" accessories, but it also extends out by 4" if you need extra length for clearance issues. The drawback is your weight capacity is...
    view full answer...
  • Is There a 2" Hitch Reducer Adapter That Can Be Retracted
    I do have some great 2" to 1-1/4" trailer hitch reducers but none of them retract into itself. There are option that offer an extension like part # C45770 but these also reduce capacity. If you need the extra capacity then you'll want to use part # HT02 which is just a simple reducer adapter without extension.
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  • Hitch Pin Holes on Draw-Tite Hitch Do Not Line Up
    The Draw-Tite hitch has one set of holes for your hitch pin to go through. There is an extra hole on one side in case you decide to use the optional Tow Ready # 63201 J-pin lock set and anti-rattle device instead of a standard hitch pin. While I am not right there to see the issue, I suppose it is also possible that your bike rack has a 1-1/4" square shaft that you are trying to put in a 2" receiver. Most 1-1/4" bike racks come with an adapter for 2" receivers. If yours does not you could...
    view full answer...
  • Which Trailer Hitch Receiver With Hidden Crossbar For 1 1/4 Bike Rack On a 2016 Toyota Sienna
    I have another option but the 1 1/4 inch trailer hitch receivers for your 2016 Toyota Sienna do not have hidden crossbars. My recommendation is to use the Draw-Tite Max-Frame Trailer Hitch Receiver # 76112 which has a hidden crossbar but a 2x2 receiver. You can then use a trailer hitch adapter like the Curt Trailer Hitch Receiver Adapter # C45770 to convert the 2x2 receiver to a 1 1/4x1 1/4 so you can still use your Kuat Bike Rack. Using a trailer hitch adapter will reduce the maximum...
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  • Trailer Hitch Options for 2021 Cadillac XT5 1-1'4" or 2" Receiver
    I do have a solution for this, while currently no one makes a 1.25" hitch for your 2021 Cadillac XT5 we can offer a Reducer # C45770 with 4" extension or # HT02 with 3" of extension. They are 2 similar options with different lengths of extension. I do recommend our Curt Hitch Receiver # C13285 as it is designed to hide behind the access panel on your Cadillac. The access panel is easily removed by 2-7mm screws. And install requires no drilling or removal of body parts besides the access...
    view full answer...
  • Does Curt Offer a 1-1/4" Trailer Hitch Receiver For a 2023 Hyundai Tucson?
    Currently the 2" Curt Trailer Hitch Receiver # C94WR is the only size Curt offers for your 2023 Hyundai Tucson. You will be able to use their Reducer # C45770 which will allow you to use your existing 1-1/4" accessories. We do not have any other size receivers from our other manufacturers. The Curt T-Connector Vehicle Wiring Harness # CU94FR will give you a 4-way flat connector. We do also have the Tekonsha Harness # TK44ZR if you wish to have a 7-way and be able to install a Brake Controller...
    view full answer...
  • What 2" to 1-1/4" Hitch Adapter do You Recommend for Use on My 2021 Ford F-350?
    For a hitch adapter, the only adapters we have for a 2-inch hitch is to convert it to a 1-1/4" opening. If this is the adapter you need, I recommend the Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long # C45770. This is the shortest adapter we carry for 2" to 1-1/4". It is important to note that this adapter only works with Class III 2 inch receivers. We do have a slightly longer adapter that works for all class sizes of 2 inch hitches. That is the Hitch Adapter...
    view full answer...
  • Is There a Curt 1-1/4" Receiver Hitch for 2007 Hyundai Veracruz
    While I do have a solution for you, there is not 1-1/4" hitch that will fit your 2007 Hyundai Veracruz. I do, however, still recommend the Curt Trailer Hitch receiver 2" # 13545 for your Veracruz. In order to have a 1-1/4" receiver you simply need an adapter. I recommend the Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long # C45770 for your needs. This will allow you to use any 1-1/4" accessories you may have. I have attached a video review of the adapter for your...
    view full answer...
  • Does the Yakima Hold-Up 2 and Yakima Two-Timer use the same tongue assembly?
    Unfortunately the tongue of your Yakima Two-Timer is different from your Yakima Hold-Up 2, so they cannot be interchanged. I have included pictures below that show the difference. Your best option is two get the Yakima HoldUp EVO bike rack, part # Y02480. It is an 1 1/4" bike rack that can hold all sized bike tires. Then you would get a the Curt Trailer Hitch Receiver Adapter, part # C45770, This will reduce your 2" hitch receiver to an 1 1/4". It will allow you to put your rack on each...
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  • Recommended 2 Inch Hitch Adapter for Yakima DoubleDown
    The Replacement 2" Hitch Adapter Sleeve for Yakima TwoTimer Bike Rack # 8880519 is only compatible with the TwoTimer. Yakima did make a replacement 2" adapter for the DoubleDown, but it has been discontinued. Although this will not work for your bike rack I do have a solution. The best way to use your 1-1/4" accessories on your 2" hitch is with a hitch reducer like the Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long # C45770. Keep in mind, the use of this adapter...
    view full answer...
  • How To Use Thule T2 Classic For 1-1/4 Receiver TH9045 In 2 Trailer Hitch Receiver
    I have another option for you, but you are correct that the Thule Shank # 853-7292 you purchased does not fit your Thule T2 Classic Bike Rack with a 1-1/4" Shank. There is not a replacement shank available to convert your rack to work with the 2" version. Instead you will need the Curt Trailer Hitch Receiver Adapter # C45770 so you can use the anti-rattle hitch lock included with your bike rack, and then use the # 63232 to secure the adapter to your trailer hitch receiver. Keep in mind...
    view full answer...
  • Recommended 1 1 /4" Hitch Expander to Be Able to Use the Thule T2 Pro XT
    Hey Kenneth, so it looks like you should be able to use the Curt Trailer Hitch Receiver Adapter # C45770. This adapter would go into your 1 1/4" hitch and expand it to a 2" opening so you can use the Thule T2 Pro XTR Bike Rack for 2 Bikes # TH83JV. Just be aware that whenever you use a hitch adapter like # C45770 you will lose approximately 50 percent of your hitches overall capacity.
    view full answer...
  • Parts Needed To Use Thule T2 Pro XTR 1-1/4" Bike Rack On Vehicle With 2" Receiver Hitch.
    The design of the Thule T2 Pro XTR Bike Rack # TH23JV you have is only for a 1-1/4" receiver so you must use an Extender/Reducer # C45770 when installing on a vehicle with a 2" receiver. You can replace the Lower Assembly # TH37MY which will convert your current bike rack to fit the 2" receiver without an adapter. This will effectively give you the Thule # TH83JV bike rack. As that is a very expensive part you might consider switching to a bike rack like the Kuat Transfer V2 # KU74FR. The...
    view full answer...
    Image 1 for Image 2 for
  • Is It Possible To Fit A 1 1/4" Bike Rack On A 2" Hitch?
    The only option we have for the 2021 Toyota Venza is a 2" hitch. If you want to keep your bike rack, I recommend you look into the Curt Trailer Hitch Receiver # C89UR. This is a USA-made hitch that is high quality and easy to install, no welding required. In order to use your 1 1/4" bike rack with this 2" hitch, using a hitch adapter such as the Curt Receiver Adapter # C45770 would be a great option. The only downside to this would be that the hitch capacity is reduced by 50%. For...
    view full answer...
  • Hitch Pins for Use with Curt Trailer Hitch Receiver Adapter # C45770
    Hitch pins are not included with the Curt Trailer Hitch Receiver Adapter # C45770. The reason they aren't is that not everyone needs a hitch pin so instead of forcing people to pay extra for a part they may not need it's offered separately. For the 1-1/4 inch portion of the adapter the pin and clip you'd need is the part # F-4 and then for the 2 inch portion you'd want the part # PC3.
    view full answer...
  • Curt RockerBall Shock Absorbing 2" Ball For 800LB Trailer Pulled by 2010 Subaru Forester 2" Receiver
    I have a recommendation as the 3,500lb Curt RockerBall # C94CR is only designed to be used with 1-1/4" Class I and II ball mounts. Since you already have 2" draw bars/ball mounts you can use the 7,500lb Curt RockerBall # C40047. This will fit your 2-1/2" wide mounts. This will work with your trailer even though it is only 800lbs. Do not be overly concerned with the weight ratings as these are maximum weight ratings and the reason the other RockerBall is so low at 3,500lbs is the 3/4"...
    view full answer...
  • Recommended Adapter for Installing 1-1/4 Inch Hitch Accessories in 2 Inch Hitch
    Anytime a hitch accessory is left in a receiver for an extended period of time, you'll run the risk of the hitch and the shank of the accessory or the adapter corroding over time and becoming rusted together, which is why we don't typically recommend leaving hitch mounted accessories installed in the receiver when they're not being used. Applying some grease to the shank of the hitch accessory and the shank of the adapter will go a long way toward preventing this from occurring, but I'd...
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Installed by:
Kathleen M
Employee Adam E
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Employee Chris R
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Employee Wilson B
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Employee Isabelle B
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Employee Kristina F
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