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double = two big chain rings, triple = three rings.
if your rear cassette is a 10 speed, then a double would get you 20 speeds and a triple would get you 30.
imho i'd stray from the triple, you don't need that much gearing in vancouver.
note that the geo's on the two bike are also VERY different! the specialized looks very relaxed and the caad is more aggressive.
just depends what you're hoping to use the bike for, what you like and what feels right in the end!
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