The most common size that you will find for cars is a 255/35/20. Second would be a 245/40/20. I just ordered the BFG KDWs for my 99 STS (245/40/20). I was going to buy the Falken Azenis ST-115, but was told the BFG was a better wet traction tire (I live in Seattle). I have the same tires on my Lincoln and I am happy with them so I don't expect any surprises.
Kale
Kale