hi all, this is my first post on the forum.
i have recently purchased a Bianchi Spillo Rubino hybrid bike size 51. the sizes available in the store were 47 and 51. according to the store guy, size 51 is a "L" size and 47 is "M". i am being quite tall(almost 6'2") he suggested a size 51. i tried the bike in the store..liked it and purchased it.
after riding it for a day or two i had a feeling that the bike is somewhat small for me.
i came across a bike sizing chart which mentions that for a guy of my height, size 55 bike is needed. now after reading that i tried talking to the store guy but according to him 51 size bike is right for me.

i would like to get some advice from the senior members of the forum if the bike size is right for me or not and also any suggestions are welcome.

thanx and warm regards.