It depends on how deep the gravel & sand is. If it's only a thin surface layer I'd go Mezcal on both ends or Peyote front Mezcal rear. If it's deep enough that the tires will start sinking in, then I'd go Barzo on both ends or a Barzo front Peyote rear combo. I've only ridden the 26x2.25" versions of the above tires so I don't know how the bigger sizes perform.
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