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chiroshi-
There should be no voltage on the bike itself - there’s something wrong. No two ways about it. And if it’s 160v it’s coming from the 240v supply side, not the low voltage side of the charger (which I imagine would be 24 or 36v). There’s a chance it’s just eddy currents but I’d be surprised and concerned if I got zapped by it and it was measuring 160v to earth. All kinds of wrong. It should absolutely be insulated to the point that no voltage reaches the bike.
It might only be a little zap, but that’s like saying a cars “only a little bit on fire”.
Take it back to the shop. Contact Bosch. Tell them there’s 160v to earth from the frame of the bike. It would be insanity for them to ignore you.
Nef
Take it back to wherever it was bought from, it’s categorically in fault condition.