Quote:
Originally Posted by Mavus
There is no gamble. If your car is not running properly ie driving smooth with non * spec tires of stock sizing there is an issue with the car. I switch from Mich * spec to non * spec Bstone snows and the car is smooth with both sets. Mich are 19” and Bstones 18”.
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I dare say if I fitted non spec tires on my new BMW and there was a problem and I took it in the dealer could refuse to look at the car or at least look at it under its new car warranty -- being in my case the car is not even a month old -- due to the presence of tires not sanctioned by BMW.
However, had I even had plans to non spec tires I'd first drive the car enough to confirm that with the spec tires the car was not manifesting any issues.
So if the car manifested any issues I would have a high degree of confidence it was the tires.
But I just don't feel any desire to experiment with using non spec tires.
I didn't buy the new car with the thought that all it needed to be perfect, or just better, would require me to run non spec tires.
Non spec tires don't have to manifest any untoward behavior to be wrong for the car. Back in 2009 I bought a German sports are with AWD and a staggered wheel/tire setup. The factory had some guidelines regarding front and rear tire diameter differences. Go outside of the allowable tire diameter differences and the viscous fluid coupling used to transmit torque from the rear axle to the front axle was at risk of damage.
My current BMW (M8) is AWD. I will stick with using spec (Star) tires to avoid putting the AWD system at risk of damage.
'course it is my car and I can do that if I want.
The flip side is one can choose to do something else. While one can do that I don't recommend it. I don't like to recommend going rogue with tires and counting on the person having the same good luck as the person -- there's always one -- that swears non spec tires are great, harmless, and has never had any problems.