my super6-5 was 18.2 stock w/o peds. Porky wheels and other OEM parts. But it lightened up pretty quick with SRAM parts, 3T cockpit and different wheels.
Congrats on the CAAD8, you'll enjoy it and if the alum fails, you have a nice lifetime warranty to back up your purchase.
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Rule #10 // It never gets easier, you just go faster.