I have found appending site:edu remarkably improves google results. For both the tire question and with respect to a youtube dowloader, the first results were

I have found appending site:edu remarkably improves google results. For both the tire question and with respect to a youtube dowloader, the first results were on the nose with the addition of site:edu on Google. Why this is needed and whether a noncommercial, information rich web portal should exist are questions for another thread.