Cannondale/Canyon
Weights: 8.9kg / 7.76kg
Difference: 1.14kg

Wheels: 200g, advantage Canyon
Handlebar/Stem: 150g, advantage Canyon (FSA Gossamer ~320g, stem ~110g)
Radar: 70g, advantage Canyon (based on Varia 515 weight)
Headlight: 150g, advantage Canyon (based on typical headlight with battery)
Seatpost: negligible (220g for Canyon not that light, C’Dale specs 350mm post - fairly long)
Tires: 40g (Conti GP5k likely weigh just a bit lighter than Rubinos in the same size)

= ~610g

This leaves 500g unexplained, though I think the two likeliest are:
- C’Dale measures a 56cm, no idea what size Canyon measures
- The Canyon used is their SLX model, so one step up from their SL, likely giving it a bit of an advantage with type of CF (~200-300g or so)

Stripped of their nonessentials, I wouldn’t be surprised if the Canyon was still about 1-1.5lbs lighter (450-675g) due to the wheels (200g), handlebar/stem (150g), and probably a slight advantage to the frame (~200-300g)

All that said, I’m surprised that C’Dale is going for ‘value add’ with the headlight and radar rather than ‘performance’ with nicer carbon or lighter wheels.

My 20.7lbs Bianchi (with new wheels!) now holds the record for a 29mi, 1300ft route of mine, over my 19.4lbs Lynskey. I credit the difference to much tighter gearing, which makes it just a little easier to stay between 80-90rpm on rolling grades. Aside from gearing, the Lynskey should be better in every way - lighter, more aero wheels, much newer drivetrain, similar positions on the bike. So I wouldn’t discount that factor, in peoples’ pursuit of speed.