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

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

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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 Free expert support on all CURT products. Guaranteed Lowest Price 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 (79)
  • Q & A (0)
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  • Why etrailer?

CURT Hitch Adapters

  • Hitch Reducer
  • Fits 2 Inch Hitch
  • 4 In Extension
  • 2 Inch to 1-1/4 Inch
  • Bike Racks
  • Cargo Carriers
  • Hitch Mounted Accessories
  • CURT

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.


  • Hitch adapter turns your 2" Class III trailer hitch receiver into a 1-1/4" receiver so that you can mount a bike rack, cargo carrier or other 1-1/4" hitch accessory
  • Extended length allows your hitch-mounted accessory to clear your bumper
  • Strong, steel construction
    • Solid 2" shank
  • Gloss black powder coat finish offers superior rust resistance


  • Application: 2" x 2" trailer hitch receivers
    • Fits Class III hitches only
  • Receiver size: 1-1/4" x 1-1/4"
  • Maximum tongue weight: 350 lbs
  • Length: 4" from center of hitch pin hole to center of hitch pin hole
  • 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

Item # C45770

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   (79 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.


Recently I purchased a stealth hitch for my 2022 BMW X5, (model SH25VR), and had the techs from etrailer install it. I could not be more pleased with the quality and service that I received. Since this is my wife's car, I knew she would be very conscious of the appearance and this style of hitch gives the best of both worlds, completely hidden, (when the receiver is not engaged), and easy to install when needed. I've always been taught that you pay for quality once, and with this product and installation, that is truly the case.
Kevin B.


Again, a well-made product! I love buying products that are made right here.


It does the job, but it does have some wobble. I got this to put a bike rack on, and needed to get an anti-wobble kit to hold it in place. I suppose if you had a trailer the wobble wouldn't matter as much, but watching my bikes bounce around through the rear window was unsettling.

Once there are multiple attachment points on a hitch accessory, sometimes an anti-rattle device like Item # e99007
etrailer Anti-Rattle Hitch Stabilizer for 2" Hitches - Vinyl Coated Steel
is needed.
-- Etrailer Expert Sierra K - 10/21/2021


Worked as described and allowed continued use of older bicycle rack made
for 1 -1/4 hitch.


Exactly what I needed. Thanks etrailer!


Bike rack is 1 1/4 inch and I needed this adapter to put it into my 2" hitch receiver.
Adds a little distance to keep the bikes away from the back of my Jeep.

Great product. Does exactly what its supposed to do.
John H - 10/01/2020


Product performed very well. Price was very reasonable, customer service was excellent and it was shipped and received in about 48 hours. Would highly recommend

no issues at all. Met expectations
Glenn W - 07/25/2021


Etrailer helped me buy the right item and it has been perfect. I never shop anywhere else for my trailer supplies.


So far great!
Waiting on the 2nd part,
the actual Lock & Roll hitch that will be used with this reducer...


The 4" adapter is about right for length.......not too short and not too long.
Heavy duty construction should bring longevity of use. I don't like the "slop"
fit ......but imagine it has to be that way. Ordered bracket to tighten this up to
stop movement of the bike rack and for other uses. Would suggest the sales
force mention these brackets to make it one purchase, instead of two, if people
want to tighten up the fit. The adaption from 2" to 1 1/4" for bike rack is perfect.
Company sells several options for stopping the rattles and sway.


Bought this to put into Curt hitch receiver in order to fit my bike rack. No issues and looks great. Highly recommend.


As advertised


Hitch adapter is exactly what I ordered. However this review is not really about the adapter itself. It is about's customer service. The adapter was shipped in the box along with a new hitch that I had ordered. The shipper somehow destroyed the box and only the hitch arrived. The adapter was lost. When I reported the missing adapter, immediately shipped out a new adapter, which I received a couple of days later. Problems do happen, what makes the difference is how a company responds and takes care of the problem. response and handling of the problem far exceeded my expectations and will be one of the reasons I will consider them first for any of my needs that they can supply. Bravo Zulu


The over-the-phone customer service to help me select the correct product was excellent.


Excellent service from etrailer , been buying from them for years .


The trailer hitch and accessories we purchased through etrailer for my wife's RAV4 Hybrid were reasonably priced, excellent quality, and have proved perfect for our needs. It's the 2nd time we've purchased a similar package from you nice folks. I've learned you're exactly the place I need to go when I need a hitch or related products. Thanks from a most satisfied repeat customer.


Fits, works, little loose so it’s got a slight rattle, but serves its purpose.


Your website is easy to use. The quality of this tow bar adapter looks very sturdy and well made.


A bit loose fitting allowing for a bit of movement. For a bike rack that's not ideal but it still works fine.


My items arrived quickly and as ordered. The detailed videos made installation simple and easy to do in one afternoon.


This is the second time we've ordered from etrailer. Service is top notch - they always communicate each step of the way and delivery is fast. A couple of items were on backorder and they let me know right away and gave us suggestions of similar products, and the expected date if we chose to keep our original order. We stayed with the original order and the items came well before the date they thought it might be.


The hitch pin and clip didn’t fit the 2” receiver part to small. It needs a 5/8” x 3” to 31/2” long hitch pin. The other pin sent fits the 11/4” receiver but still to short for clip to go in.

Tried to call two different days after receiving order could never get through.


This is a simple product that allows you to use 1 1/4 inch receiver mount in a 2 inch receiver. I'm using it for mounting a ATV winch receiver mount in the front receiver on my pickup truck. As with all steel Curt products it is very well made and seem to have powered coating to make it last a long time; time will tell.


The adapter is pretty straight forward. I am writing this review because I wish I had called and spoken to someone when I first bought the hitch. I bought the hitch (no shipping charges), then realized I need an adapter. I paid shipping charges for the adapter and then realized I really wanted anti-vibration, locking pins (more shipping charges). This is no reflection on etrailer, they're great. But there is a lesson to be learned from my lack of forethought.


Excellent Adapter for extending and attaching a Thule bike rack to a 2" receiver. More solid than a Thule sleeve, and the extensions provide ample clearance to open the SUV Rear Door.

Show More Reviews

Ask the Experts about this CURT Hitch Adapters

  • 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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  • 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...
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  • 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...
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  • Availability of Hitch Adapter to Go From 2 Inch Hitch to 1-1/4 inch Hitch
    Yes we do have hitch adapters to go from 2 inch to 1-1/4 inch hitches with the part # C45770. We do not have any hitches at this time for a 2022 Lexus NX 250.
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  • 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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  • 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.
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  • 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...
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  • 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 Solution to Reduce Hitch on 2020 Lincoln Corsair From 2" to 1-1/4"
    I have a solution for you, but I don't recommend using any adapter that extends the hitch away from the vehicle similarly to the Curt Trailer Hitch Receiver Adapter - 2" (Class III) to 1-1/4" - 4" Long # C45770 since those will reduce the tongue weight capacity of your hitch by 50%. Instead, I recommend using the Hitch Reducer 2" to 1-1/4" Trailer Hitch Receiver # HT02, which won't reduce the tongue weight capacity but will still reduce the 2" receiver down to a 1-1/4". This will allow...
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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...
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  • 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...
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  • Recommended Adapter to Use 1-1/4 Inch Hitch Accessories in 2 inch Hitch Receiver
    If you have the Curt Class III hitch, part # C13119 which is a fit for the 2012-2016 Honda CR-V and you're needing a reducer so you can use an accessory meant for a 1-1/4 inch receiver, we do offer hitch reducers that can make that happen for you. In some cases, a reducer will also provide some extension, thus increasing the distance between the vehicle hitch and the hitch mounted accessory, such as the Curt # C45770. Because that distance is increased, the capacity (both towing and tongue...
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  • How Can I Make My 2-1/2 Inch HItch To A 1-1/4 Inch Hitch
    When it comes to reducing your 2-1/2 inch hitch to a 1-1/4 inch hitch there are a couple different parts you will need. First you will need The Curt Hitch Receiver Reducer Sleeve - 2-1/2 inch to 2 inch # C45405. Then you would need to use The Curt Trailer Hitch Receiver Adapter - 2 inch (Class III) to 1-1/4 inch - 4 inch Long # C45770. When using The Curt 2 inch - 1-1/4 inch adapter will reduce your hitch's weight capacity by 50 percent. Do not use this hitch adapter in towing applications....
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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...
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  • Trailer Hitch Receiver For 2022 Toyota Sienna For Bike Rack
    There are indeed only 2 inch trailer hitch receivers that fit your 2022 Toyota Sienna, though if your bike rack only fits a 1-1/4 inch hitch, you can use a hitch adapter and reducer. First, for the hitch, by far the best option for a bike rack for your '22 Sienna is the following: - etrailer Trailer Hitch Receiver # e56RR Not only does the # e56RR have the best bumper clearance, but it also has a matte black finish which hides the inevitable dings and scratches better than glossier finishes....
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  • 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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    Image 1 for Image 2 for
  • How to Use Rola Convoy with 1-1/4 Shank on 2012 Jeep Liberty with 2 Receiver
    There is not a specific adapter for the Rola Convoy # 59307 to adapt to a 2" receiver but you can use a hitch reducer sleeve like the Hitch Reducer 2" to 1-1/4" Trailer Hitch Receiver # HT02 to make the 2" hitch on your 2012 Jeep Liberty into a 1-1/4" receiver. I prefer this to an extension type adapter because it uses the existing receiver and does not extend away from the cross tube significantly, so it won't reduce your tongue weight by 50% like the # C45770 would.
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  • Two E-Bike Rack With Ramp For Class III Hitch - 2019 Ford Escape
    Thank you for your feedback! I've got a solution for you. While we offer quite a few hitch racks that are compatible with your e-bikes, it sounds like a ramp is pretty important to you, which narrows the field a bit. While I don't have the complete specs of your trailer hitch, it's likely that you have a Class III hitch installed on your 2019 Ford Escape with a 2" receiver, with a tongue weight capacity of at least 300 lbs. The Yakima # Y36FR bike rack comes with that ramp you're looking...
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  • 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.
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  • Using an Adapter on a 2 Hitch for a 1-1/4 Boone Outdoor Tailgate Table on a 2018 Ford Edge
    You can indeed use a hitch adapter to pair a 1-1/4" accessory like the Boone Outdoor Tailgate Table, part # BH70114, with a 2" receiver. Using an adapter reduces your tongue weight by 50%, so remember that if you plan on towing heavier accessories with a 1-1/4" shank. If you are worried about sway, then you need an adapter that has a shorter shank. I recommend the Curt Adapter, part # C45770. It only has 4" between the center of one hitch pin hole to the other. I've linked to a video review...
    view full answer...
  • What 2-Inch Class III Hitch Do You Recommend for a 2006 Nissan Murano?
    If you still need a hitch installed on your 2006 Nissan Murano, I recommend the Curt Trailer Hitch Receiver # 13571. The Curt Receiver has a class III rating, and will be able to handle 3,500 pounds of gross towing weight and 350 pounds of tongue weight. As far as construction, the Curt hitch will be able to take a beating either on or off-road. The hitch bolts securely to your Murano's frame and comes with all installation hardware included. As far as an adapter, you will not need an...
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  • 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...
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  • 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"...
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  • Trailer Hitch for 2020 Ford Escape Hybrid
    I am happy to help you find a hitch for your 2020 Ford Escape Hybrid. I contacted Draw-Tite to discuss the # DT92RR hitch, and they are currently researching its compatibility with the Hybrid model after discovering issues with fitment near the exhaust. I recommend you go with the Curt # C23FR hitch. It is a confirmed fit for the Hybrid and there are some helpful customer reviews showing it installs and works well on your vehicle. The Curt hitch is a 2 inch instead of a 1-1/4 which will...
    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
Installed by:
Adam E
Employee Chris R
Video by:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
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