I have looked through this forum and searched on tires but didn't find this question. If I am duplicating, I am sorry. I have P285/30ZR19's on the front and P335/25ZR20's on the rear and am looking for tires that can be driven in temps below 40 degrees without adverse effects. I am told that no winter tires are available in these sizes, especially the rear. So, what tire sizes are acceptable as replacements that can be driven in lower temps? Where are they available? Thanks much.