when my street tyres were on 36psi cold, the tyres didnt wear evenly as they were about 41psi after a session. The bloke that works as a mechanic in wakefield (also a professional driver) suggested that i deflate them to 30psi as it was a hot day and the tyre then began wearing evenly.
When I had mine at 33 psi cold, the shoulders wore out within 2 sessions. The next time I went with fresh tyres, I used 40 psi and the tyres wore evenly. I'm still using that same set of tyres today. The weight of the car also affects tyre wear. At 33 psi cold, the tyres were rolling onto the shoulder tread and wearing it out every time I took a corner because my car was fat and heavy.
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