The Strv 2000 clocked in at 58 t. And this tank is light only in terms of armour protection, which does not bar it from being an MBT, just a more fragile and lighter one.
Now for a bit of fan wank. Who else thinks that the Spectre isn't using a conventional arrangement of the crew, engine and battle compartments? It looks an awful like VK 45.02 (P), A-44 and the other designs with a mid-mounted engine. - 18.104.22.168