i´ve changed now to 225-40-16 and 245-40-17 on the stock 16-17 inch rims. the only available tyre for the front is dunlop sp9000 (with the speedindex we need in germany: ZR) on the rear i drive on dunlop sport maxx. i never want to have mixed profiles , but after driving in the 9000th, it workes real good. so thats my reference for those rims. i must have gone to the TÜV and let it write down in the papers of the car, but now its all ok.
presure is 2,0/2,5 bar.