1-1/4 Inch to 2 Inch Hitch Adapter | Buyers Products
2'' Class III/IV to 1-1/4'' Class I/II Receiver Hitch Adapter Insert S
Reese Towpower 1-1/4-in to 2-in Opening Receiver Adapter at Lowes.com
Not exactly bicycle repair, but would you run this? 1 1/4 to 2 inch riser and extender hitch to a Thule bike rack with a 1 1/4 to a 2 inch adapter : r/bikewrench