Yesterday whilst riding to work I had something weird happen with my bike whilst going around a roundabout. It's a rather large one and I was turning pretty hard, going about 40~50kmh, holding a little bit of throttle whilst going around, but slowing down a bit. I was nearly at the point where I'd havw to turn back the other way to exit the roundabout, still going right when the wheel suddenly jerked right. It was rather disconcerting. I think it just gave the right bar a quick push to correct it, but I'm not sure, I was more focused on how I'd nearly crashed again. But my question is, what caused that to happen and how do I stop it happening again? Was I going too slow/losing too much speed? Going to fast? Turning in too hard for the speed I was going? Or had I reached the limit of the awesomely awesome GPX handling?