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.
Wine storage temperature should not go over 75ËF (24Â°C), for longer than brief spans of time. At 75Â°F, wine begins to oxidize. An ideal temperature for storing a varied wine collection is 54Â°F (12.2Â°C). Letting the temperature drop below 54Â°F won't hurt the wine; it'll only slow down the aging process.