I was recently reading an article in RIDE magazine (December 2010 edition), reminding me of the risk of permanent hearing loss in motorcyclists. Motorcycle engines are largely exposed and normally rev at least twice as fast as car engines, so they generate a fair bit of noise compared to cars, even with a legal exhaust. But it’s not the engine noise or exhaust noise that is the problem. Rather it’s air turbulence around the rider’s helmet (especially around the neck region). It’s tricky to measure noise levels inside a motorcycle helmet. You could create a helmet the size of a room, so that you could fit in your motorcyclist, the…
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