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Steel is almost 2.5x density of aluminum. The GR upright/knuckle doesn't look 2.5x less volume/material, so it definately is heavier. And i am a sucker for anything lightweight. For sure cheaper per kg to change these to alu than to get the lightest (read: mag watanabes yum yum) wheels. Wonder what's the reason, cost? Wonder if stiffness is really that significantly different and whether that makes a diff. But yeah, GR still is faster, wonder why. But then again, it's less than half a second faster. Splitting hairs haha.
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