The 5.2 SL also has the Bontrager Race XXX-Lite fork, which is 90 grams lighter than the Race X-Lite fork that comes on the standard Madone 5.2.
Lately, I've been riding a standard 5.2, and for whatever reason, I find the grey/carbon paint scheme really boring. Personally, I'd look into the SL simply for the cool Midnight Duotone paint. It looks great in person.
Giant - one-piece, relatively generic, overseas-built frame
Trek - Lugged OCLV frame, built in Wisconsin, shares carbon fiber process patent with Raytheon, who uses the same carbon and molds to manufacture flight control surfaces for jets.
I had the same dilemna. Just imagine a 5.2 or a 5.2sl...Both are rockets, but the sl has a ton of advantages, ie the 110 over the 120. The stems, the fork, the look.
Just go buy the SL...see you on the road
unless you are planning on doing long 100+ rides the 5.2sl won't make much of a difference from the 5.2. Save your money and put it back in the bike in another area...I.E wheels, or a super awesome saddle or something like that.
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