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Can anyone help me understand the rationale behind the extra gear of most Bosch engines? My guess is that each rpm I make, allows the engine to spin 2.5 times faster than it otherwise could. And somehow this is preferable when it comes to small Electric motors. But if there is some truth in...

I just passed 2000 miles on my bike. But how many miles could one reasonable expect to get from a Bosch motor? A dealer who isn't a Bosch fan, quite the opposite in fact, suggested that at about 4500 miles, the engines would start to break. What are Your experiences?