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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. 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 (113)
  • Q & A (0)
  • Photos

CURT Hitch Adapters

  • Hitch Reducer
  • Fits 2 Inch Hitch
  • 4 Inch 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 Satisfaction Score:

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   (113 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.


Perfect solution to adapting my hitch to my bike rack.
The people at U Hall were very helpful.


eTrailer has a great selection of products and excellent customer service. When my order got lost in transit, Brandy did a great job looking into my case, helping me reorder over the phone and keep in touch with me via email.


Best to get with Curtis Hitch


Well constructed. Happy with it so far.


Ordered for our Kuat rear mount bike rack, as our SUV had a larger hitch receiver. Well built, clean machining and a perfect fit. Fast shipping and exactly as advertised. Great communication surrounding the order. Couldn't recommend more.


The fact that it's steel is a plus, and it extends the hitch so that the bike rack that's attached now is far enough away from the hatch to not bang against it. Great product!


On time delivery, thanks!


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.

John M.


Great product. Does exactly what its supposed to do.


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.

Etrailer Expert

Sierra K.


Once there are multiple attachment points on a hitch accessory, sometimes an anti-rattle device like Item # e99007 is needed.


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


Very good service, products as expected delivered at time


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


great company! quick turnaround. when i installed a new axel on my trailer a few years back support was always there for my questions. i recommend them for anyone needing the products they supply


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.


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

Glenn W.


no issues at all. Met expectations


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.


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.


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.


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.


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.


Purchased this when I got a new hitch from etrailer for my new car. Made sure I'm ready for any possible hitch situation, and this fit the bill perfectly. Great price, great product.


About what you would expect. A little more play than I was hoping for. Bike rack was a little wobbly but some tie-downs shored things up. Well made product.


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


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.

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