The carbon rear triangles have more tire clearance vs alloy, so that's a factor.
I'd think there's some notional/possible improvement in suspension action from lower un-sprung weight, I'm just not sure it's enough to matter on a bike. Could be though.
I wish my alloy had more tire clearance, there's times I'd like to be able to have a 2.3" tire on their with crud/mud clearance, and it's just not there to my comfort level. It's not a HUGE want as the 2.2/2.25" tires are fine ... there's just times I'd like something phat for rim protection from high speed rocks.
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