180 to 190 rear tire

[rules]

I would not change to a 190 tire. The 180 tire has plenty of grip, and a wider tire requires greater lean angle for a given corner at a given speed. On page 107 of Motorcycle Dynamics by Vittore Cossalter: "...the use of wider tires forces the rider to use greater lean angles [than with narrower tires]...".
There is a fairly simple formula to calculate the lean angle required for a given speed and turn radius. This formula calculates the lean angle for a line between the center of the tire's contact patch and the center of gravity of the motorcyle+rider. However, as the bike leans into the corner the contact patch moves over onto the side of the tire. The wider the tire, the further the contact patch moves to the side, and so the true lean angle (of the centerline of the bike) is greater.
Interestingly, another side effect is that the required lean angle is also greater with a lower center of gravity. Honda found this out the hard way back in the day. To lower the COG, they designed a 500cc 2-stroke GP race bike with the fuel tank under the engine and the expansion chambers over the top of the engine. It was a total failure because it just would not turn. Everyone learned that road race bikes need a high center of gravity.

Now that is an answer and a half, and makes perfect sense. Thanks!

So what I need to do is wear this Michellin out quicker and fit a RoadSmart 4

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