only44

I'm interested in knowing if I can fit 325 width tires on a Panamera that originally comes with 315/35/20 tires for the rear. I noticed that the Turbo models come with 325, but the standard ones only with 315. I have purchased Michelin PS5 tires in 325/35/20, while the front tires remain the factory size of 275/40/20. I'm concerned about potential issues with the transmission and differential due to the difference in wheel size. Thank you in advance.

Chimuel

No issues going to 325. I went from 315 which was the stock all season size for my Turbo ST.
Wheel size stays the same but the tire width/sidewall ratio is only slightly different, at least for me at 21" wheel size:



For your tire size and wheel size:

sac02

I agree with Chimuel,

Tread depth on a new tire will typically be about 9/32". Tire is considered dead at 2/32".

That is 14/32" (0.44") change in diameter over the course of it's normal life.

0.44" simply due to normal wear is more than the 0.3" difference in diameter due to 315 vs 325 size as calculated by Chimuel above, so it should be allowable.

only44

Okay, thank you very much!