You can climb a pile of ice glazed rocks like a cat! Standard issue here for winter riding. I've tried them but never took the $$ plunge, I think next year I will as there are now more inexpensive alternatives. Dry rocks will tear them apart though, you have to be carefull how you use them especially here or you through your $$ away. In frozen sand they should last forever.
I've ice raced with the screws but for frozen trails they just get spit out too fast.
Its funny, in spring you can see all the rocks/logs on the trail scratched up like a bunch of lions or something used them for toys.
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