Hello going by the catalog your bike does appear to be a 1986. I am hoping the pictures make that Lago Blue look greenish. there was no Brava in '85 and in '87 it came equipped with 105. as for the size of BB that depends on the type of crankset you will use but I think the shel is likely english. FYI the other color was Rubino Red. the shifters and derailuers are just listed as Sprint, with no indication of index. three models down there is a bike listed as having Cyclone derailuers with Sprint with 'light action'. I do not know if that means something 'retro friction' or not.