Rinspeed 23″

Hello a few months ago I bought 23″ Rinspeed rims (315/25 23″ and they mounted on my Cayenne V6. I noticed that from about 110 km/h the steering wheel vibrates. At first I thought that the tires were immovable. But they were balanced out ok. That I can’t expect comfort is already clear to me but the vibrating of the steering wheel is not normal. If someone has the same experience or knows where it can come from. Thanks in advance for the help. MfG