Ridley is coming with the Helium SL for next year at around 750g they say but they also came up with this Limited Edition bike. 58 bikes at lower weight with less paint and logos.
The frame is 739g:
But the part that impressive more on me is the fork. 280g with a long tube:
Not many but at least on nice logo:
The bike is built up with Sram Red, Zipp 202 and the lightest 4ZA Cirrus parts for Anthony Kumpen. Complete 5,74kg: