I normally ride in a 58 (which is measured in centimetres, the circumference of my head) but borrowed a friend's 56 and that fit. I have a 56 here that's way too small.
I just took a measurement of my head and it's 56.5cm/22.25" around. Head length front to back of 18cm/7 1/4", and width side to side of 5 1/2". So... what size CO should I get? I'm looking at "The Rider" model, would it fit my head shape?
This is the helmet in question: