The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test track. A tire graded 200 would last twice as long on the government test course under specified test conditions as one graded 100.
Most wine racks are designed to allow a wine to be stored on its side. The thinking behind this orientation is that the cork is more likely to stay moist and not dry out if it is kept in constant contact with the wine. Some wineries package their wines upside down in the box for much the same reason.
Interesting answers, but mostly wrong. Red wine should not be refrigerated, as the low temperature will affect the flavor, and not for the better. Wine is essentially a living thing, and as such is sensitive to temperature, light, air (oxygen), even motion. All these things can alter the flavor.