I run a 28x12.50 bias et street at the track and am lowered about 1" in the rear. Fenders are rolled/BFH'd and tires are centered in the wells with adjustable suspension. I trap 135mph so they grow about an inch in diameter at the big end and they haven't rubbed.
-98 NBM Z/28:
370ci | T56 | twin 6165 -85 Chevy Silverado SWB:
383ci sbc | T56 | 4.11