2" To 1-1/4" Hitch Reducer

Convert a Class III or IV hitch to a Class I or II hitch with this hitch reducer. This handy adapter is great for bicycle racks, cargo carriers or any hitch mounted accessory that requires a smaller hitch size. Simply slide the hitch reducer over a Class I or II hitch tube, secure with integrated set screws and slide into the Class III or IV hitch.

  • Aluminum construction
  • Two integrated set screws secure to hitch tube
  • 1/2" pin hole size
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1 Year Warranty Curt Trailer Configurator


Converts 2" Class III/IV hitch receivers to 1-1/4" Class I/II, great for bicycle racks, towing applications, cargo carriers and more! Features a 1/2" pin hole and (2) set screws to pinch the 1-1/4" hitch tube.


Reduce a 2" Class III/IV vehicle hitch to work with 1-1/4" Class I/II hitch products with the ADPT-637 Hitch Reducer, or convert 1-1/4" hitch mounted products to work with 2" receivers. Designed to fit inside a 2" hitch, this in-line hitch converter measures 4"L x 1-15/16"W x 1-15/16"H for a snug fit and includes (2) integrated set screws that pinch tight on the inserted 1-1/4" hitch tube. With both the class 2 hitch adapter, and the coupled 1-1/4" hitch tube aligned properly, they can be secured to the vehicle hitch with a 1/2" hitch pin (not included). The 1/2" pin hole is distanced 2-1/2" or 1-1/2" from center to end depending on orientation. Made with aluminum construction, finished in a smooth black powder-coat. Includes a one year warranty.

2" to 1-1/4" Hitch Reducer - Fits in-line, includes (2) set screws to pinch 1-1/4" hitch tube
2-1/2" & 1-1/2"

Product Features

  • Allows 2" Class III/IV hitch receivers to work with 1-1/4" Class I/II hitch products
  • In-line adapter measures 4"L x 1-15/16" x 1-15/16"
  • Fits inside 2" hitch receivers
  • Converts 1-1/4" hitch mounted products for use with 2" receivers
  • (2) Integrated set screws pinch on 1-1/4" hitch tube
  • 1/2" Pin hole with 2-1/2" or 1-1/2" distance from center to end
  • Aluminum construction with a black powder-coat finish
  • Hitch pin not included
  • 1 year warranty

Warning and Usage Guidelines



Instruction Manual


Trailer Hitch Classes and Applications

Review Summary (Based on 5 Reviews)


5 Stars Simple Solution, love it

Joshua from CO wrote (January 27, 2015):

Perfect solution to fit my old bike rack to my new SUV with a class 3 hitch. Unlike other hitch solutions, this keeps the rack flush mounted and not extended out by 3 - 4 inches.

5 Stars 2' to 1 1/4 hirch reducer

MIKE from FL wrote (November 07, 2014):

We could not order our new Rav 4 with a 1 1/4 trailer hitch receiver for our bike carrier. The vehicle came with a 2" receiver and reducer. The reducer was sloppy to the point we felt it unsafe to use. Research on the internet showed the one from Discount Ramps to be a good selection. That was great advice. It works exactly the way one would expect. I had a question for customer service and called their 800 number. The lady was friendly, helpful and really knew her product. I would definitely recommend this product.

4 Stars A review

John from DE wrote (October 16, 2014):

Delivered as promise

5 Stars 2" To 1-1/4" Hitch Reducer

Keith from IL wrote (September 28, 2014):

Perfect for using my class 2 bike rack to my class 3 hitch. Unlike other hitch reducers, this keeps the rack flush mounted and not extended out by 3 - 4 inches.

4 Stars Hitch reducer

Gabriel A Castrillon from CA wrote (September 18, 2014):

I order the hitch reducer and I received it with three days. The product seems of good quality and I will be using it this weekend on my bike rack. The two integrated screws are missing and I am hoping to get them from Discount Ramps soon or may be I can purchase them at a hardware store. I am giving 4 stars rating, because of that. Are the screws supposed to be included?