It is a Campag 8speed cassette,
13, 14, 15, 16, 19, 21, 23, 25, by the way the chainset is 51/42 no 51/41 as stated.
Top of top tube to floor. 788mm about 31"
Centre of b.b. to floor 263mm. 10 and 3/8" with 23m tyres.
[attachment=0]IMG_20150530_143853368__1435078804_20053 (640x360).jpg[/attachment
I have now reached an age and level of fitness when I am going to restrict my riding to my tourers and hybrid so have decided to put my Bianchi Road Bike up for sale.
It is Columbus SLX, 21.5 C to Top ,seat tube...