I need a new helmet. I am interested in the Limar f-111, and as usual the sizing charts get me right in the middle. 56.5 cm. I was wondering if Limar size charts tend to run small or large. With the F-111 small size ending at 56cm, is it better to go for small or larger. Is it better to have a helmet that fits "tighter" or a little "looser". Thanks for any information.