According to AutoData, the std front tracking settings are:
Brera 2mm +/- 0.5mm, so big difference between the extremes of 1.5mm & 2.5mm.
159 2mm +/- 0.8mm, so even more extreme at between 1.2mm & 2.8mm.
1.2mm toe-out will wear ok, 2.8mm toe-out will wear very quickly.
That's odd - I have what I am told is the most recent Alfa Service News on Brera wheel angles in front of me (which I sent to SR with the idea he might publish it for the rest of you) and the toe settings are much smaller than AutoData says. It varies with rim size: 16 is -0.45, 17 is -0.50 and 18 is -0.55 all +/-0.5 mm.
At my 18,000 mile service I was advised that my right side tyres had worn edges (I've been swapping them back to front to even up the wear) and that I should get my alignment checked, which is whem I thought 'if I'm going to pay someone to f*@k about with my settings I might as well find out what they should be first'.
I found these people: www.AlignMyCar.co.uk
and, at 20,000 miles, went to one of their agents (Autocity, who were brilliant) for new tyres and full alignment. Toe was a little out on the right, both front and rear but particularly rear. The Hunter alignment machine had specs for the Brera in it already which come in the form of software updates. Although they express toe in terms of degrees and minutes, when I cross-checked, their figures agreed with the Alfa sheet I had.
I could have maybe got another 3,000 miles out of my first set without going to the extremes seen elsewhere in this tread. Hopefully I can get even more out of the new set - and before anyone says it, I haven't nursed my first set, I do enjoy driving in a fairly 'spirited' style.