There is one way for you to carry a pair of bikes with your 2021 Cadillac CT4, though I verified with the manufacturers that there are no trailer hitches that fit. There are also no trunk-mounted bike racks or roof racks for your CT4, leaving a single option, which is a SeaSucker bike rack:
- SeaSucker Mini Bomber Bike Rack for 2 Bikes - Fork Mount - Vacuum Cup Mount # 298-BM2006
The Mini Bomber # 298-BM2006 uses vacuum cups to attach to your roof, which you'll then mount the bikes to.... view full answer...
You may be able to have a custom receiver made for your 2021 Cadillac CT4 using a Curt Weld-On 2" Receiver # E17. I do not see that any manufacturers are making a receiver that will fit your CT4 and the AT4 chassis is different so you will not be able to use one from that vehicle. A customization shop may be able to make you a receiver with the part above.
We also have a 1-1/4" Receiver Tube # E-911 if you want the smaller tube for better ground clearance. view full answer...