Today the received wisdom of the majority of many people in Britain is that if don't wear a helmet when you cycle you are being irresponsible or even reckless.
The simple logic being that the responsibility for protecting his or her brain lies with the rider. Not with motorists, road planners, road maintainers and cycle designers. This logic is based on the precept that cycle helmets will usually protect you from the type of head impact that will commonly occur when a cyclist is thrown from a bicycle and then lands on their head.
However, there is little real world evidence that current helmet designs can be trusted to protect the brain as well as most people believe. The before and after head injury statistics from countries where cycle helmets have been made compulsory do not show the drop in head injury numbers that the politicians predicted.
The testing of helmets using methods that imitate real world accidents show rotational accelerations that are many times greater than the brain can withstand. Also many times greater the rotational accelerations measured when the same tests are carried out on motorbike helmets.
If current helmet designs and testing standards are based on a misconceived notion of the type of force that causes most brain injuries, then their continued sale and promotion is a scandal. Nobody expects a polystyrene helmet to protect you from the wheels of a ten ton lorry but they are expected to offer more protection than a hat. But research that concludes that in some accidents you could get more protection from wearing a baseball cap suggests that a serious rethink the way helmets are designed is urgently needed.This is an extract from the conclusions of a scientific evaluation of bicycle helmet design and effectiveness:
"Designing helmets to reduce linear acceleration suits the helmets industry which has, in
effect, made a huge investment in the theory that it is the main cause of brain injury. Because the theory is widely accepted, claims that helmets prevent injury or even save lives are plausible enough to persuade the public to buy them and politicians to pass laws to compel their use, creating an assured market for them. Finding practicable means to reduce angular acceleration is an unsolved problem, however; there is no money in it for industry."http://www.cyclehelmets.org/papers/p787.pdf
9/16" Suntour BMX MP-1000 pedals / 56 tooth TA 6-bolt chainring.(I'm not bothered if the teeth are worn or damaged)