can't believe BMW ever let the 16inch bottletops even into their factory let alone out with a car attached to them
I'm probably one of very few members that still run the Z on 16" rims, believe it or not it was one of the requirements when I bought the car and this was based on my experience with our daily drive Series 1 - 118i which has 17" rims as standard. A few years ago bought some winter wheels through BMW which were 16" steel rims non R/F tyres.
The difference in ride, comfort, noise level was pretty remarkable.
Some of the change I attributed to the smaller wheels, the rest the NRF tyres. This occurred a few years before I joined the forum and now being much more knowledgeable :x , 90% of the improvement is down to the tyres.
The Z4 with even 16" wheels and NRF tyres would probably open my eyes.