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.
It sounds like youâre doing your best to keep the bottles away from light, extreme heat, temperature fluctuation and vibration. A lot of wine lovers are just like you, and a corner of the closet will have to do. Itâs OK to keep wines in cardboard boxes, but it would help if you put the boxes on their sides or upside down, so that the wine stays in contact with the corks, which will help keep them from drying out.