Lemme go look at my XLR...
Mine says: "Seamless, Heat Treated, Butted 7005 Series Aluminum"
I can't imagine they'd use a different frame for the XRL than the 550/660 though.
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Current Stable: Trek Emonda SL - Trek Top Fuel 8 - Scattante XRL - Jamis Dakar Expert - Trek 9700 - AlpineStars Al Mega