Compact doubles shift a little better and easier than a triple - they're also that little bit lighter.
I have one bike that's a compact double and one that's a triple. You're used to way easier gears on your trek fx than most people have on a road bike - you've got smaller chain rings up front than a road triple, and you've got what's basically mountain bike gearing on the back - road bike cassettes typically have the biggest cog available as 28 - but that's changed recently since shimano came out with a road cassette that's bigger this year. And since most of the time you say you ride that in your two smaller chain rings up front, I'd probably say you shouldn't switch to a compact double yet. The cannondale is going to be a lot easier in terms of having smaller tires, etc. and more efficient to get going - and I'm not saying that you can't use a compact double - just that you're going to miss your gears (you already do) and you probably shouldn't make so drastic a change just yet.



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