I am planning on getting a Calfee tandem with the new Calfee carbon triple crankset. This set uses an Isis bottom bracket. I would like to get ceramic bottom brackets. On Ebay, the have ceramic Isis bottom brackets with 108mm and 118mm spindle lenths. I bet the Tandem Geek would know if these would work for the front bracket and rear bracket with a triple chain ring. Does anybody know the proper spindle lenghts to use? It is hard to find Isis ceramic bottom brackets, ceramic Isis brackets are not as plentiful as ceramic external bearing bottom brackets.