Tire weight varies, max, by about 100g. so If I had the heaviest possible, they had the lightest possible, you're still talking about over a pound, around 500g, to account for. my cranks are 30g lighter. the bars, stem, & saddle are probably a wash. his pedals are around 50g lighter. My frame is a medium, so even his frame is heavier.
If you think 1.5 lbs is plausible on two comparable bikes with aluminum parts, you're insane. Unless I had some old school freeride bike parts(I have a set of diabolus cranks that weigh twice what these cranks do) aluminum parts don't vary that much.
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