They may/will rub on turns and in situations where there is extreme deflection (ie: high speed pothole). I have upgraded my W126 to P205/65-15 from the 14"s w/o issue. I got lucky & found a set of 15"s with the proper offset. You should be able to find an upgrade wheel with appropriate width & offset so that you can avoid rubbing issues. You may still have some issues with toe out on turns (squeal, wear). Also make sure the upgrade tire can support the weight. Good luck!