I have replaced my worn front tyres (215/55/16) with winter tyres (205/55/16). Will there be any problems.
It's difficult to answer you without more details about your car. If your car is approved with 205/55x16, this won't be a problem.
However, if not, your speedometer may give a false reading. So, to be avoided. To look for a winter tyre according to the vehicle, try rezulteo.