Watched a guy blow out a side wall of an 10 year old MTB tire using a compressor on a Schrader valved tube. Scared the jeepers out of both of us, then the humor of it set in. He had his own pump the next time we met. Not sure the need for Schrader valves on a any bike tire. Get a little sand in one when you pump it up and the valve core is almost always ruined, in my case anyway. I was raised using Presta and all of the pumps at my home and on my bikes are set up for them. They are available at just about anywhere I buy cycling supplies.