What parts have failed on your bike?

[pacman]

Hi,

I'm curious what parts fails most frequently on china bikes. So please post what parts have failed in this thread.

In 3 years I've had:

1 . Battery
2. Wiring (bad connections)
3. Speedometer
4. wheel bearings (all of them)
5. Broken motor mount

I'm hoping we could make a list of things that needs regular inspection or maintenance.

Thanx!