Casco - ROADster Plus; Bike helmet with visor in a modern, urban design
Size Guide helmets
Do you want your helmet to sit correctly on your head?
Then measure your head circumference in centimeters before buying.Take a flexible tape measure, place it at the widest point at the back of your head, run it over your ears and hold it together about 1 to 2cm above your eyebrows.Read the head circumference in centimeters - cm - and find your size in the size chart.Please compare the information again with the item description.Alternatively, you can determine the head circumference with a thread or string.Put the thread around your head in the same way and simply read off the measured length on a ruler.
This is an approximate conversion chart to help you find your size.