Moisture is the problem from winter, concrete will draw moisture and cause rusting. The carpet/ plywood method is a moisture barrier not to stop flat spotting tires.

 

Is it possible that "not storing a battery on concrete" got confused with the whole bike?

 

Ah, you like to play on words, uh?...........I ask you, "What is softer?" Oh yeah, rubber. I use a lift to store my bikes. I let the suspension sag just a bit and let the tires lightly touch the wood.

Why is it that when tires sit on cement for extended periods that they leave a stain(imprint) behind?