In less than 3000 km? Tires, if they are knobby. Rear wheel gets some work, likely. Inexpensive bike wheels are often not tensioned that well. Without some attention after it settles in, you are going to start popping spoke heads.
What damage the rain does to drivetrain or brakes depends a lot on your cleaning and lubing. But we don't get a lot of weather here, so I don't have that factor.
My stuff succumbs to mishap or boredom long before I'd consider it worn out. Especially loading it and bouncing it around in the back of the truck.
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Genesis 49:16-17