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I am a little surprised that your tires are showing signs of oxidation like that after two years, but I wouldn't worry about it too much. My tires don't usually last long enough to get like that on the bike, but I have some 22 year old tires on a car. They have lots of little cracks, but hold air and are generally fine for driving a car on.
The thing that would concern me, especially on a bike, is that tires get harder as they age. After they get to a certain point, you won't see much tread wear, but you also won't stick to the pavement very well, either! I don't push it in the car (it is 34 years old), partly because it WILL spin out on the old tires. You don't have to be going that fast on old, hard tires to get a good, lurid slide.
If you are going about 6000 miles a year, you will be buying new tires at about the end of the summer. That way you would have fresh tires for winter riding- sounds like a good plan to me.
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