Originally Posted by LotusBoy
Sounds wise to me ! But still, there is a small difference between front and aft wheel diameter. So using a front wheel aft, as a spare, should IMO be kept to the minimum.
I wouldn't want to drive a tank of gas like this, with even a remote risk to the diff ...
You can always do a "double" change like I did on my Honda S2000, but the way I would approach would be to match the diameter of the rear and then slight mismatch of front would be no problem...