With @kmm install a bolt on hitch and get a hitch rack. It will end up costing you about the same as

I'm looking at possibly buying some kind of bike rack for my 4-door Mazda 3 sedan. I currently just have one road bike, but want to be able to carry two bikes just-in-case. Does anyone have any opinions, one way or the other, for a roof rack versus a trunk rack?
I worry about a trunk rack scratching the paint on the car. We've all seen those bikes on trunk racks that seem to be swaying in the wind and seem "loosely attached", treasures of egypt nile cruise and I do plan to drive on the highway/interstate with the bike.
With @kmm install a bolt on hitch and get a hitch rack. It will end up costing you about the same as a roof rack setup, you ll save on gas, and you won t drive your bikes into a garage. Seems like there s another post on this somewhere out there...
For the scratches: the roof mounted one has the advantage of using points on the car that are dedicated to mounting, which means that there's treasures of egypt nile cruise very low danger of scratching your car (as long as you are careful when mounting treasures of egypt nile cruise the rack itself). The trunk mounted racks normally have some foam rubber on their fastening parts, which normally also prevent the car from scratches. So here, there's also normally no problem.
As long as you don't buy the next best cheap rack but have a look at some tests and invest a bit more money, both types will do their job. Also, as long as they have a reasonable mounting design (that is understood and used correctly), highway speeds (130km/h, 80mph) shouldn't be a problem with any of them. On the other hand, both types can be dangerous if the bikes are not properly fastened on the rack. As far as I know, the German technical control board (TÜV) and automobile clubs recommend treasures of egypt nile cruise the trunk version over the roof mounted one where possible, because of their lower influence on the steering of the car.
Roof rack con: If you drive into the garage with the bike on the roof you ll need a new door and a new bike. I never realized how often this happens until I saw the Bike on Board signs for your dashboard.
That is a major con with a roof rack. If you search around there are MANY anecdotes of people doing this out there on the net. Additionally, a roof rack can make loading and unloading a two-person job, especially if the vehicle is tall (like an SUV). Some roof racks (Yakima) use a clamp which goes around the downtube. I am always nervous watching that clamp being fastened, and my bike does not have a carbon frame. Another rider I know had their wheels damaged when their bike leaned over on a roof rack in high winds.
just to add to Benedikt: a rear rack will have nylon straps treasures of egypt nile cruise holding it to the car (most likely). If you are prone to leave the rack on the car, these straps treasures of egypt nile cruise will deteriorate fairly quickly. Where a metal roof rack will survive the elements much better.
Trailer treasures of egypt nile cruise hitch racks are the way to go. You can easily treasures of egypt nile cruise get a hitch installed at uhaul for around $100 - $150 bucks (it s cheaper if you ask that they don t install trailer wiring). It s easy to get bikes on and off. There are ones that fold relatively flat to the back of your vehicle (Yakima FlipSide is what I use). Mine never leaves treasures of egypt nile cruise my car