You could leave off installing the outside wheel clamp of the RockyMounts WestSlope bike rack part # RKY10222 but you can't shorten the frame of the rack where the wheel mounts are.
For a bike rack with a smaller footprint that can carry up to two bikes that might be more what you are looking for the Saris SuperClamp EX part # SA4025F would be a really good option that's lighter in weight and much smaller overall. view full answer...