For a frame like yours, you only need a 111mm bottom bracket with a triple crank, the 115mm is for frames with fat tubes.
Like this http://www.totalcycling.com/a-z/bottom_brackets/bottom_brackets_road/bbc6_centaur.html
or a non-campag one like this http://www.highonbikes.com/token-carbon-square-taper-campagnolo-bottom-bracket-111mm.html#.UX1xhbXvuPs
@Manc_Ronnie started
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For a frame like yours, you only need a 111mm bottom bracket with a triple crank, the 115mm is for frames with fat tubes.
Like this http://www.totalcycling.com/a-z/bottom_brackets/bottom_brackets_road/bbc6_centaur.html
or a non-campag one like this http://www.highonbikes.com/token-carbon-square-taper-campagnolo-bottom-bracket-111mm.html#.UX1xhbXvuPs