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...