/ Rocks or Walnuts for winter climbing?
I carry a set of each just like I do in summer. No noticeable difference in icy cracks.
You don't want the nut sitting on ice because it will fail when you fall on it. If you give it a tap with an axe it goes through the ice and loads the rock. While I slightly prefer wallnuts because of the offset shape, I don't think it makes a difference and have my most abused nuts for winter, whether they are wallnuts, rocks, BD thingys or metolius thingys.
Rocks have a bigger surface for hammering into cracks, but I generally just use the oldest nuts on my rack of either type.
Walnuts are more festive.
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