I bought a couple of biys from these guys and now they email me with special offers and clearance items etc. This little helmet cam thing seems pretty cheap - might be worth a punt if you're thinking of doing some vids. Better than gaffer taping your Iphone to your helmet/bars and hoiping you don't lose it. For £40 it doesn't really matter!
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Is that bits of piston ring firing out your tailpipe?