Mine was drifting badly to right and of course they only replaced the front two tyres after a lot of mucking around (which did fix the problem). Then at the 10,000 service I asked that they swap the old backs onto the fronts and the drifting came back. They have given me two new fronts today (4 in all now) and I need some time to see if the drifting has gone away. Yes they are same Re040's but assure me that these tyres have a Neutral Bias whereby the old one's had a Positive Bias, (However, I can't find anything about positive, neutral or negative bias in tyres to explain it)
However, it might have a lot to do with "runout" see: http://www.carbibles.com/tyre_bible.html
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