I had 305's on the back of my car for a while, but found they rubbed quite often. Especially with a full tank of fuel and a passenger.
When I dumped the BFG's and went to the (much better) Avon's, I went down to a 295, which very rarely rubs.
My car does sit fairly low on QA1's, so that may have been a big part of the issue with the 305's.
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