Hey all Well, im doing my course this wkend and hope to have a bike soon. just looking at helmets tho... first up - any hints on sizing? got some stuf from the web, but any tips are most appreciated!!! Secondly, my dad used to race cars - has a helmet, never hit and only used maybe 6 times...does anyone know if theres any difference b/n a CAMS approved car racing helmet and the bike helmets? im looking at full face to wear w/ a road bike. Thanks heaps guys!