Now i know it is smart to wear a helmet riding down Portrush Rd in heavy traffic, or tearing down from Mt Lofty on a race bike, but if i want to ride down to the local deli on my old school pushy or roll up and down Rundle St letting latte sipping hipsters admire my flowing locks, then i believe it should be ok to go sans helm. After riding all over Europe last summer i grew accustomed to riding…