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I have a set of SZ50s with about 16K on them. There is plenty of tread left on them save for the outer edge of the front tires. I have noted this problem on several other C4s as well. Does this treadwear pattern result from factory specs or is there some other reason for it? I don't drive my car particularly hard, so I don't think it has anything to do with my driving habits.
The tread wear can come from many different possibilities. As indicated before, tire rotation is a factor and one of many possibilities.
Factory Alignment Specifications can be altered to adjust to driving conditions; such as concrete roads vs tar roads, how much curve is built into the roads, highway vs. local driving, etc. A good alignment mechanic will align the car and make necessary adjustments to the factory specs.