I had a new experience at the end of a 4 hour flight last Friday in to KGSO, great big runway and when I touched down, on center line, it started to drift pretty rapidly to the left. I was able to control the plane and regain the center of the runway so all was good. I checked the tire to make sure it was aired up, and for any bald spots from brake dragging and found nothing. I posted on Facebook about this and a number of folks suggested I look up an article by Don Maxwell called; The 8 Second