I run Mickey Thompson drag radials at about 13-15psi on a spare set of rims I change out at the track. They are the expensive ones that require tubes, which are also not cheap each for drag tires. With those I can hook up about 1.84 60's. On street tires best I ever got was a 2.08 in Oregon and could only get 2.2s in Boise at Firebird.