Test drove a Toyota "certified for 6 years and 100K miles" 2003 LC with 60K miles that had 18" wheels the other day. Never test drove a late model with the 18" wheels before and it felt really different from a LC with 16" wheels. The ride felt stiffer and when I was on rough freeway pavement the steering wheel shimmied like it had a unbalanced tire, but when I was on smooth pavement even at 70+ mph it didn't shake at all (so it couldn't be a tire issue) Is what I felt normal? I need to drive another for comparison, but thought I would ask for your opinions.