Bike sizing
I'm no expert but I used to be 6'3" when I bought a Bianchi Road bike. (I'm now 76 and 6'1") I wanted a larger frame but the salesman who raced bikes said there was no need, a smaller bike was lighter and my size could be fitted with seat height and handlebar stem height and reach. I bought the size he recommended and with the mods was very happy with it.