I am travelling with my road bike packed inside my car in the next days. While thinking about how I will fit it in my trunk, I remembered that a lot of people put some sort of spacer in their fork/frame dropouts to prevet any damage from forces that are compressing the fork/frame when no wheels are installed.
Although this is probably more important when traveling by plane, when the bike is packed up in a container and has to sustain the harsh handling that airport luggage undergoes, I was still curious about this.
So to the actual question: Do thru axles screwed into the fork/frame without the wheels offer the same protection as special spacers made for bike transportation or is it worth getting some special equipment for this?