I had 27" tall MT drag radials on 15" wheels and in 70° weather had mid 1.5 60 ft times. I went with 16" wheels with 28" tall M&H drag radials and in 93° weather at the BPG event last weekend had 1.8 60 ft times. I wonder if it was the 16" wheels, the tires or the hot track and weather that contributed to almost .3 slower 60 ft times.