Patrick, you name the two most obvious: plus tires and longer chain stays. There are other geometry differences that are beyond my comprehension, including a shallower head tube. However, Beorn is nimble and spry like a bear is nimble and spry, which is to say not neither of those, but a more apt description is sturdy, hearty, lithe, stable, sure footed, capable of just rolling over things. The Hunqapillar is a vastly different riding experience on technical trails from the QB, and GBW is twice that difference again from the Hunqapillar. The differences between the three are much less noticeable on roads than trails, and become more noticeable as the rough and technical increases. I hope that helps. For sand alone, you'll be amazed the difference.
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