How much leeway do you have in helmet sizes
So yeah, I'm going on a trip with uni and ideally need a helmet. I tried on a 61-63cm helmet which was a very smug fit, but I found a nice looking one on ebay going for £16ish. The only thing is, it's 63-67cm, would it still fit me or would it be wobbling around on my head?
Already hit my head really hard twice (3 day long headaches lol), so it's probably best if I make sure I have one for this, but I'm living on a student loan so want to keep it cheap :P