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My run to date is slightly less than 20,000 km (12,500 miles approximately). I rode along the asphalt road, when I heard a rumble, a thud and noise from the engine. As far as I can remember the theory of machines and mechanisms, the bearing resource in the automotive industry is 2500-10,000 hours.So these damage and destruction of the bearing are very strange and unpleasant for me.
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