I've gone down the 12 volt route aswell.I've actually fitted mine underneath the seat with a long enough hose to reach the rear tyre valve when it's near the top,and powered it via a fused switch.I first did this on my long distance trial bike a few years ago and despite all the dust/mud/wet/heat it never played up.When i got to the end of a particular section i just flipped the seat up and turned it on....and smiled at all the other guys puffing and panting with their hand or foot pumps(in full bike gear of course)!
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Just going for a short ride on my bike....
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