I am wanting a little bit less wind pressure pushing on the bike. Almost all the riding I do is highway and Interstate.
Wind is wind and having a wider tire does not necessarily keep the bike from being blown around. Even big bikes get blown around with enough wind. I do understand your desire for stability though. On the hwy the Ninja can seem a little squirrley when wind hits it the right way. A wider rear wheel does offer a little more lateral stability but may be not as much as most think it does. Of course everyone will have the own opinion on what the bike should do and feel like. But only you as the rider will know best what feels right for you.
Depending on who you ask, there are only a few advantages to a wider tire on a 3.5 in rim.
1. Looks cooler
2. Looks bigger and wider
3. Rides (handles) better, more stable
4. May offer better mpg (also dependent on gearing)
Disadvantages (which most won't admit)
1. Very snug fit (pinched) on the stock rim (depending on manufacturer)
2. Very little clearance on the swingarm (with stock gearing)
3. Taller sidewall (which changes the overall circumference and speed)
4. About the same size contact patch as a smaller tire
6. A little nimbleness (handling) is lost.
I currently run Bridgestone Battlax BT-45 in 140/70 and 120/70 17's on my bike. Anybody that has run the 130 & 110 stock tire knows the tires are really good. I say one size up is even better. On paper they are very close in size to the stock size 130 and 110 I took off.
Both tires look good with little evidence of pinching on the rim. In the stock configuration (14/45 sprocket combo), this tire would be really tight fit in the swingarm, but doable. Because the sidewall is so stiff, there's little chance of sidewall flex. My wheel is pulled back approx .5 in, which makes for plenty of clearance in the swingarm.
Good with acceleration out of the corners, tracks well while leaned over. No sketchiness when transitioning from side to side. As far as the Ninja's "flickability" goes, on these tires the bike feels a slight bit heavier, so that it's not as quick to go over, but a slight adjustment of the riding style fixes that quickly. The bike actually feels like it has the handling of a bigger bike. With a little more width (both front and back) the bike leans over a tiny bit more.
The small change in front wheel diameter did make a small change in the speedo reading. Before the speedo read approx 5 mph faster, now it is an avg. of 4 mph faster than actual speed. Overall the bike feels solid and steady at interstate speeds.
You can find wider tires at most motorcycle tire store. The biggest I would recommend is a 140 on the stock rear rim. Anything bigger should be placed on a wider rim. You maybe able to find some wider rims here;