What is the widest tire I can put on my SF before getting into the swing arm? Stock is 130/70x17. Will a 140/70x17 or 150/70/17 fit?

 

140 should fit.. 150 would be pushing it..

 

Yeah thats what I have just found doing some Google searching. Looks like a wider rim is needed for the 150

 

I don't see a need for anything bigger than a 140 anyways..

 

Thats also what I was thinking

 

My research concluded 140 metric, or 5.10 imperial.

Your question begs another however: are you looking for handling or aesthetics? If it's the former, wider isn't always better. If it's aesthetics, do as you please.

 

Looking for handling. Playing around corner's working on dragging knees and the stock tire seems to want to break free a little to easy.

 

The stock tire size is more than enough for that bike. It you experience traction issues, perhaps your air pressure is a bit too high (or low).

You could certainly also get a softer tire.

 

I have no experience specifically running a 130 back-to-back with a 140, but I do have experience with a 180 & 190 on the same bike & same track. My observations may translate (or, not?):
-I noticed that the narrower tire turned-in to corners easier & more neutrally
-I noticed that the narrower tire tracked better through corners
-I noticed no difference in traction under acceleration
-I noticed no difference in traction under braking

Additionally, I’d suggest that there are other factors such as compound & profile, which vary by manufacturer, that have a greater impact on handling/traction, than the width. Pressure & temperature also play important roles.

All this is to say that in my experience, a wider tire may not be the solution to your problem, particularly if you haven't exhausted less costly options first...

 

Guess i will stick with the stock size for now.