• I don't think it would be that futile, I mean a drilled chain ring you could probably reduce the weight by 25% maybe?

    Maybe. So that is 20g from a chainring. What other parts are safe to drill? (assuming a chainring is)
    If you save 100g from drilling parts do you really think you would notice it?
    I can safely say that when I have changed a part for a part that is 100g lighter there is no way I have noticed, hence futile.

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