I put a Kenda 270 150/70x17 on the rear of my SF and Kenda 270 120/70x17 on the front. They fit fine and once I got used to them they feel fine. I recommend keeping the 110 up front to maintain the same steering properties. See this link for some useful tire specifications.
https://www.kawasakiforums.com/forum...ad.php?t=29713

 

I have the wider excell rim and run 150 fits fine for me and plenty of space.

 

Sorry if it's been asked alot, but how does the bike feel with the 140 on the back and does anyone have a pic of there 250SF with the 140???

 

Anybody??? Pic would be awesome.

 

I went to Cycle Gear and asked to see what they had. Nothing except touring tires! (which can't hang!) I have seen some on Ebay but I'm a little leary about that.

 

Im still convinced a 150/60/17 tire will fit...im gonna buy one as soon as my stocker wears out.

 

The 150/60r17 will fit for sure with a 4.25" rear rim; however, it's VERY close to the chain and will rub a bit. I just converted my '07 to a motard and I'm loving every second I'm on my bike!