It's a BMW thing. I want to say they've done it since the earliest days of BMW, but I'm not 100% sure. I'm like 80% certain that their first production bike had a boxer engine and was shaft driven. They have done some non-boxer and chain driven bikes since, but those are the odd ones out.
I had a bike with a chain drive and the damned chain broke on me once. Shaft drives don't do that
I have never had a shaft break on a bike. That's true and I'd never put much thought into that.
I have had a driveshaft break. I've also had CV shafts break. But I've never had the driveshaft on my bike break. I wonder why not? They get plenty of torque tossed at them, even for the size.
I don't know why. They must be over engineered for the torque. I have never heard of anyone breaking a shaft on a shaft drive bike
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