So im gonna spring for some nice new angled valve stems and was just gonna buy the 90 deg ones but then i started reading info on how 83 deg ones change the angle which reduces the stress on the stem at ultra high speeds. Is this snake oil hype? What are the odds of failure? I may see 160 but dont plan on riding cross country at 160. Looking at Bridgeport and Moto-D. Guys have been fine with 90 deg for years, right? What say you?