will it really make a difference if i get a helmet that's 1cm too big for my head?
the next size up (is the only one available) is a large which is 57cm to 59cm and my head is 56 cm. will it really make a difference? like tolerable or like no, dont buy it
It depends on the helmet. I'm sure you can get it to fit, but the shell will probably be a size bigger, too. This could give you that Speed Racer look where the helmet looks way too big for your head.