Looks substantial enough. Would be easier it if the chain stay simply had the mounting though. Not sure why Haibike went for the need an adapter option.
Ah. Looking at the bike I now see what you mean about mounting inside the back wheel. I can see a recess with two holes where it would fit. Unfortunately the shape looks different to the one in that bikeinn link. Will have a hunt around now that I understand what I’m looking for. Thanks again.
Thanks for the info. No it doesn’t have the holes and the shop have said that it would need an adapter that they can’t get hold of at the moment, so this may be it. I assume it clamps around the chainstay somehow? The photo in the link doesn’t make it clear.