With their big ugly welds, aluminum frame MTB generally isn’t quite as pretty as their carbon fiber or titanium counterparts. That said, the German-made Frace F160 weighing 16,3 kg is an exception, as its frame is milled from a solid block of aluminum. Its MTB frame starts life as a 70kg slab of 7075 aluminum that quickly gets turned into the mainframe. It may sound like this leaves a lot of waste but the off-cut material then gets used for…