So I got a unipack and want to upgrade

well then i should ride a 53 then so im 3 cm's off which is actually quite alot i agree, but when i went to get my frame jos an keith measured me and said i should get a 55cm or 56 cm for my height so i went on what they said to me thinking they knew what they were on about

when you put the new cranks on i reckon it will fit better
cos the unipack ones are 170 cm?