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I'd be inclined to think that a typical carbon frame should be able to keep the usual assembly of pro components afloat.
A quick back-of-a-fag-packet calculation says the frame & fork (1.5kg) will displace something like 2kg, tyres and deep rims (2kg) probably nearly 3kg. That would give a reserve buoyancy of about 2.5kg to hold everything else up, so the remaining 'solid' parts (3.5kg) would have to have a mean relative density of 3.5 to make the whole ship neutrally buoyant. Since solid aluminium has a relative density of 2.7 and some of the bits in question are either carbon fibre (less dense) or contain closed voids, it's likely that a road bike should float without being under the UCI weight limit. Two empty bottles would add nearly a whole kg of reserve buoyancy. Call off the witch hunt
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gbj_tester
Soz if this has already been discussed elsewhere on the forum.
Crossposting from the pro-season thread.
Is there any hold in the speculations that the picture below proves that the bikes in use are lighter than 6.8 kgs? I'd be inclined to think that a typical carbon frame should be able to keep the usual assembly of pro components afloat.