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@BringMeMyFix
Yes - it alters the grain structure or something. With small amounts of scandium added to the aluminium (I think it's 0.4% for Easton's tubing) you can build a frame as strong as 'normal' aluminium, but with significantly thinner walls and tube diameters - therefore lighter, and you could build in some of that compliancy synonymous with steel to varying degrees, based on intended usage.