Thanks for that article. I wonder how many people can use one of those devices? I would love to try it, Infantry got my ears, no doubt!This is off-topic as it gets, but there is hope for us ear ringers:
A noninvasive device designed to rewire brain circuits reduced symptoms of tinnitus in a large, exploratory clinical trialwww.scientificamerican.com
Even if it did make noise I'd still prefer the 8-spd for the better gearing off-road..