Randy, thanks for your reply !

I guess you are right about added "stress" for components but I am not sure how "bad" it is. There might be some "nominal" stress added with aftermarket tires/wheels. I am planning to keep my 16" wheels and just want a car-like, soft and quite tire as I do not do any offroad stuff. Another thought that I had was the gas milage. Technically speaking the wider tire will give you more resistance. Will that cause worse gas milage ?