Yeah, technology can be a bitch sometimes, and ya have to maintain it rigorously. That being said I will never lose the Speed-hub... especially with a mid-drive putting over a full horse-power into the drive-train. Having a continuously straight chain-line is pretty crucial when I am climbing with multiple hundreds of pounds often.
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I was a little dismayed to see oil leaking from mine (Speed-hub) in 2017 when I took my bike to Oregon to experience the eclipse, more than a little dismayed.
Eclipse 2017
When I got back I found that it's normal for them to leak when the bike is laid down which I did in the back of a pick-up. I should have strapped her it standing like I would a motorcycle. (Wow, that sounded dirty.) Speed-hubs aren't sealed units, they are open to atmospheric pressure. All this seems like a pain-in-the-ass to anyone that can just throw their bike down like I did when I was a kid. But a heavily loaded ebike and trailer isn't something you lay down anyway... not if you're lucky. That's one of the reasons the center-stand is so essential to how I ride. Speed-hubs can also be overfilled. I went about 3 weeks last year dealing with BaFang controller issues and know what it's like being "down". The only reason I would ever own two bikes again, to have one as a back-up. If... (knock on wood) my Speed-hub ever requires repairs I will get another and send the original back to Rohloff themselves to do the work. "My" bike mech is good and can strip, clean, inspect, and re-fill a Speed-hub but even he doesn't rebuild them.
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The same goes when/if (more when I think) the BBSHD needs a major service or rebuild, buy a new one, mount it, and service the original.