I had a front wheel come off before, I was doing around 20-30mph, i heard a big and saw my wheel fly 20 feet in the air and shoot passed me, i could stop straight away and my disc cut a line in the tarmac. The front wing was dented and I had to change all the brake bits on that side. Was a bloody nightmare, i had to get the car picked up and i was stuck in the middle of a very busy road in South London.
You got lucky!!!