Does the 2012 Linea MJD Dynamic come with 5 alloy wheels ? or are there 4 alloys and 1 steel rim ? Is there a way to use the fifth tyre? Is it ok if I change one tyre with the fifth (the spare tyre, will have it removed from the steel rim and put on the alloy rim) in rotation. This way over a few ten thousand kms all the tyres will have almost equal wear. My Linea has run 15,000 kms, is it ok to start rotating the 5th tyre now ?