Tire problems

does anyone out there have problems with tire cracks on there tires. cause after 4000 kms i noticed a few cracks and the outter edges of my tires are almost shot as well maybe i should do slower than the speed limit around corners :) but its just too much fun :D
 
What tire pressure are you using?!
Does the outer wear exist on all 4 tires? If not which ones?

I'd like to avoid this problem if we know what's causing this.
Maybe the problem is with right foot like you said. :)
 
It's just from hard driving I have them on my subie and so do all my friends with subies. My whole group of friends drive hard all the time and everyones tires are like that.
 
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