My 2005 Z4 needs to have its rear tires (not staggered) replaced after 4 years-18K miles of easy driving on good roads. The fronts still have 6/32 of tread left, and no signs of unequal wear. I can get 2 patched (nail-like punctures in middle of tread--6-7/32 treads) original Potenza 225X50X16 that show no signs of unequal wear for $150 plus blancing and mounting. Now, of course, I'm not crazy about RFTs, but it will cost me about $700 (total) to get the convential tires I like. There is a very reasonable savings if I go with the patched tires. Now I don't want to be penny-wise and pound foolish, but if the patched tires were thought to be safe, I'd go with them. So, what do you guys think about this?