I have been on pinned platforms for around 2 years now. I have never slipped and feel I can climb better, its just my experience. I can shift my foot position around, its good for me. Enjoy what works best for you.
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I think its disgusting and terrible how people treat Lance Armstrong, especially after winning 7 Tour de France Titles while on drugs!
I can't even find my bike when I'm on drugs. -Willie N.