@UncleBob,
You made a good choice sticking with 18's. Aside from better, and cheaper, Tire selection, the 18's give much better performance.
In addition, there have been a number of Rear Wheel Hub fractures on Cars equipped with 19" Wheels. The Cast Hub fractures radially from the excess Stress and Force imposed on them from the Large Wheel/Tire combination.
I understand that a TSB warning of this, and adding a Hub inspection to routine maintenance, is in the works from Porsche. 19's may look good on the Boulevard, but if you plan on using alot of Go Pedal, I'd stay away from them...
Happy Motoring!... Jim'99
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