• Not a good way to challenge the stereotype of police being thick.

  • It's a shame to see in the replies that the 'avid cyclist' daughter of somebody has been banned from cycling to school by their parent because they don't want to wear a helmet.

  • From the sounds of it another, different copper is showing schoolchildren a damaged helmet and telling the kids it saved her life. And accuracy is vital, PC Massie says.

  • Not a good way to challenge the stereotype of police being thick.

    I've seen no evidence that anyone's been trying to challenge that stereotype recently. Or at all.

  • To be fair I've had a fair few head injuries over the years and consider myself as thick as two short planks. I also do not possess a cycle helmet.
    I'm really disenchanted with the modern police service, especially their unfettered use of social media. Many of the "facts" they spout are utter bollocks and their knowledge of the laws they uphold is woeful.

  • their knowledge of the laws they uphold is woeful.

    This has been my experience. They try to make up for lack of knowledge with creativity and just make it up as they go along.

  • God, that is horrible.

  • Helmet causes death

    That's such a well known risk that the parents' actions probably amount to culpable negligence.

  • Seems the evidence of the ineffectiveness of helmets is almost as old as civilisation.

  • It's almost as if being in battles is really quite dangerous. Who would have thought?

  • how often should a helmet be replaced?
    (Assuming no crashes/ damage)

    I have a Giro (Hex?) in the garage, must be getting on for 8 years old, but not really used that much, should I replace it if i start MTBing again?

  • I'd say every 3 years or so, or immediately following some proper impact.

  • how often should a helmet be replaced?
    (Assuming no crashes/ damage)

    Interesting question that I find difficult to answer. I'm a materials scientist and test materials.

    Most bicycle crash helmets are expanded polypropylene or polystyrene in a vacuum formed shell (probably polystyrene). It's expanded into the shell in a mould in one go, so it's not glued together. Tap your finger nail all over the shell and you'll hear if it's delaminated anywhere. Replace it if it's coming off. If not, it's fine.

    Even with knocks and dents, expanded polypropylene doesn't tend to crack or come apart because it's very tough and bonds to itself really well during moulding. It does just dent. Mine is starting to look like it ought to be replaced, but structurally it's actually fine.

    Disclaimer: but if you're not confident you know what you're looking for, be on the safe side and replace it.

  • how often should a helmet be replaced?

    Once 🙂

    The timing is a complex issue. The durability of plastics depends on the environment in which they are used and stored. The principle killers are elevated temperature and UV. In a cold dark cupboard, EPS might last decades without significant degradation of its mechanical properties, but a year outdoors in Arizona might destroy its utility.

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Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

Posted by Avatar for ThisIsRob_(RJM) @ThisIsRob_(RJM)

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