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@pip
Gear inches is an old timey method of talking about the ratio of your gears and give an idea of distance travelled per turn of the pedals. See http://en.wikipedia.org/wiki/Gear_inches. So 70 gear inches is approximately 48x18, for example (well its actually 71 something but its close enough).
Gear inches kind of stuck around with the track racing crowd and for riding fixed, its pretty much the defacto way of talking about yer gearing.