Assuming you're not the sensitive metrosexual whose day is ruined by a little weight gain, there's a definite upside to having a virtually indestructible adamantium metal alloy coating on your skeleton. For Wolverine it comes in handy when, in a standoff with police, the cops wait for him to retract his bone claws, then shoot him in his metallic skull, which stops the bullet cold. Blessed with mutant healing powers, he's left with not so much as a scar. Which is all to say that it's cool if Wolverine rides a fixie without a helmet, but your fragile ass had better strap on.