[SwiftDB4]

Ward,
Forget about using 4 identical wheel/tires for rotation. On both my GT40 and Lotus Europa that I do track days with rears are wider than fronts for better cornering balance. Unless you do an insane amount of track days your race tires will probably get old before you wear them thru. Race tires harden quickly and are pretty useless after 1 or 2 years. As Bob says you can change L & R sides if camber wear is uneven.