Hi, im currently planing to change tires on my RX400h.

Currently it has oem tires installed 235/55/18. I was looking to buy the Nokian WRG2 tires for some all weather performance. Kaltire is the only shop here in Vancouver who offers Nokian tires and they are out of stock. They do have 225/60/18 available. Would this size be ok for my car? I have very limited knowledge on this and wouldnt want to have problems with the hybrid system or the drive train.