After receiving some good advice on here, I bought some Nokian Gazza Extreme Studded tires. I have put a maximum of 50 miles on them, and I have not filled them up beyond the max recommended pressure of 65 psi. I broke them in on "normal" roads consisting of pavement and dirt just like the instructions say. Yesterday I was out riding, and I noticed that the outer casing is already cracking! I only had 60 psi in them.
Does anyone know if this is normal for these tires? Should I be sending them back for replacement? I am feeling down on them now, especially after everyone assured me they would last for years.
Here are some pics: