I finally went for a P2M NGeco with Campag compact 170 50/34 4 bolt chainrings.
Will be interesting to see how it all fits together and shifts with my pre-2015 groupset.
Looks like it'll bring my bike up to around 5.8 to 6KG, which still isn't too bad.
Will update once the changes are made.
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Discuss light weight issues concerning road bikes & parts.