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'starred' marked tyres (*) are made to manufacturer particular specification. They may sometimes differ in appearance/tread pattern/compound, but are always made to much tighter sizing and weighting tolerances. I would always buy star marked tyres, not just for AWD benefits, but for axle side to side balance. A friend at work put a new set of non starred tyres on his Audi Quattro and had an annoying vibration and pulling over to the left from the front at over 50mph. I swapped the wheels over, and the vibration stayed, but the pulling over swapped over to the right, implying a tyre problem. I had him get the tyres taken off and I measured and weighed them at work - 4mm (diameter), 1.5mm (width) and 225 grams difference! Ordered a new set of starred tyres, measured and weighed them - 0.6mm on diameter, 0.2mm on width and 25 gram difference. Fitted them and vibration and pulling gone ! Take from this what you will, but I know what I would buy ....
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