Old 08-16-12, 10:13 PM
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Having actually done both, it may sound odd but I'd say 5 pounds off the bike. I can be in good training within a ~10-pound range, I don't think my W/kg ratio is necessarily varying that much. But the bike doesn't get more efficient when it's 5 pounds heavier, it's a bike.

The most eye-opening illustration would be to switch my winter training bike from its studded tires and tubes to its road tires and tubes. That's a 3.8 pound loss at the edge of the wheels, and the difference is amazing. I've also tried ditching weight at the base of a specific hillclimb that I do frequently, which resulted in demonstrably better results on Strava. So based on my subjective and objective results, I'd lean towards the bike weight, provided the rider is actually in training. If you're not in training, then sure, the training required to lose 5 pounds is probably going to be a win-win for you.
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