Hey Box,
I am close to your size, 5-1 and a 0/2. I tried the 3/4 tights in both small and X-Small. For warmth, I'm not sure they can brave a Minnesota winter (I use them in 50° California weather)
The Small fit comfortably (kinda like bike shorts) and since they stretch I though they would be fine. However, once I wore them on a run, I found that the jarring workout forced me to pull them up or adjust them every once in a while. I could probably wear these over bike shorts (since they have no chamois) and be fine, esp. at the waist since I am bent over on my bike.
The X-Small, although not a "comfort fit" for lounging around the house, were much better for running. They were VERY snug... but they are supposed to be that way. It made a huge difference in feeling that my muscles were being held together. When they called them "performance tights" they weren't kidding.
For cycling, I'm not yet sold that these are the best tights for the money, as they are kinda expensive (talking about the warmth-factor). For running, I can't think of anything better. Hope this helps.



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