every single sport bike runs a 120/17 or 16, this is just a 130, to say it is going to handle like shit and have to take slow ass turns is bullshit, hell i run a 120/21 and can rip turns, i have built several 140/21 bikes as well that have no issues plowing though turns at high speeds. Furthermore i will add that Ultras, St glides, road glides... all run 130/80B17 (well the newer ones do, the older ones ran 16") if anythign this will help the bike feel more planted on the road and offer more control on uneven surfaces such as filled road sections. most "race bikes" run 120/60/17 up front and 180/55/17 in back, granted this is not a race bike this guy is building but it is pretty fucking close to race bike tire sizes. to say it will not improve handling is bullshit, it flat out will next to the stock 90/21 that the bike comes with. I will also close that i have several customers that run buell track bikes, they all run a 130/70/17 on their track bikes as they did not like the stock 120 set ups, it is very common to see this on the front of a race bike depending on what class they are running.