Got the HC hacksaw out. 135g bars :) Now down to 6.4kg not bad with the original power2max and external di2.
http://www.ebay.co.uk/itm/Hylix-Carbon-Seatpost-27-2-30-9-31-6-34-9-400MM-152g-Ultra-Light-RD-For-7-9-Rail-/291665694090?var=&hash=item43e8a14d8a:m:myp0amh4I996xMsiWq8SUww
Is this the seatpost you have on your Planet X? I think I have the same saddle its got oval rails so a bit specific on which seatpost fits...
Mine is a bit different to that, the clamps have hooks on them instead. That actually looks like a better design.
@Monster1985 started
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Got the HC hacksaw out. 135g bars :)
Now down to 6.4kg not bad with the original power2max and external di2.