Hello all, I'm looking to get into commuting to work (will be starting out about half by car half by bike). For my situation I'm trying to avoid getting a rack for my car since my bike will fit inside the car (both wheels off), however I'm not sure if it will fit with a permanent rack attached to the frame. I see various types of racks that attach to the seat post and remove fairly easily with a quick release mechanism, but I wanted to see what kind of experience people have with these. I've seen reviews on some that say that they will shift to either side fairly easily, and my commute is likely to be fairly bumpy (roads in San Diego not so well maintained...).
Are there any of these seat post mounted racks that are more rigid than others, or am I fairly screwed and need to figure out how to fit my frame in my car with a permanent rack?