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@mmccarthy
I didn't realise you were specifically talking about XC, like i've said above (and many other times) I got a 29er because I would be using it for racing on that sort of terrian, so i'm well aware of how it has advantages in that area.
Yes smaller wheels will be slowed by obstacles more (as i've said previously) but they accelerate and decelerate qucker. And that is an undisputable fact. So if there is a lot of braking and accelerating on the course, it will play into the hands of the 26er.
So how are the MTBs so much slower then? (Cyclocross isn't exactly my area of expertise)
All things being equal lighter will mean better acceleration, both in a straight line and cornering.