Good decision on sizing up. I’m a couple of centimeters shorter than you, but similarly have a longer torso. I was in the market for a Yeti SB100 (not really XC), but had the luxury of demoing a small and medium. The small felt more nimble, but the medium felt way more stable. Like others mentioned, there’s a lot more “room” on the larger size to move about the cockpit and rear end position, yet still feel “in” the bike. The smaller size felt smallest when I was climbing out of the saddle.
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