I suspect many of the people who cite the NASA paper have not actually read the paper. Having actually experienced what I thought was hydroplaning while on a bicycle, I was skeptical of the claims that it is impossible per the NASA study so decided to actually read the study to see if it in fact said this. Most of it was completely over my head but I did note something called partial hydroplaning in the study. OK, so if one wants to split hairs, maybe I was not technically experiencing 100% hydroplaning but maybe it was partial hydroplaning. In any event, it was VERY unnerving. It was a one time event on a fully loaded tandem descending a mountain pass in Canada in the rain. The bike was moving in ways I have never experienced before or since. I yelled at my wife to sit still. She responded that she was. So, no matter what anyone more knowledgeable might say here, I am convinced that I have experienced at least partial hydroplaning that one time, would prefer it never happens again, and believe that the cited NASA paper does NOT prove me wrong. I might add the paper does also mention the liquefying of tire. Anyway, sometimes reality trumps study/theory. In reality, science is just theory. If one wants to claim that it is impossible that I was hydroplaning then I would be curious as to what your theory is on what I was experiencing. Maybe I was just hallucinating?