Why is a 30x10.5x15 M&H slick (11.50 tread width) legal and my 30X13.5X15 ET Streets (11.1 tread width) not legal?


Walter
1969 Dart Swinger w/ARC Pump Gas 493 B1/BS 10.18 at 130mph
Racing Pro in street trim.
1981 Aries ARC 548 B1 8.88 at 147mph (footbraking)
1996 Ram 2500 V10 16.52 at 80mph
1981 Reliant 400