[rauleregep05]

Hello guys my car,a bmw f36 420xd has a problem with stuttering every since i put the winter tyres on(which are new btw).I have the 441m 18" wheels in two dimensions 8j and 8.5j.Initially i put the recommended tyres for these wheels 225/45/18 255/40/18 and after a square set up with 225/45/18 all around.The care has the same problems with both dimensions.I must add ,with the summer tyres the car is running perfectly normal and smooth.I ve occurred this problem only with winter tyres on.
Can anybody please give me some answers?Thanks!