that seems like a waste of barrel width if you're going to use such skinny rubber on them. 245's on 8" rims was almost right, maybe a slight mushroom. I can't imagine putting less than 245 on an 8.5" rim, but I abhor the look of a stretch.
2012 135i. dinan stg3 | ohlins dfv | assorted rice | hardest parker evAr