I like my 27x10.5 QTPs. I put them on 15x8 wheels with 4" backspacing. Its close to the frame but works. I started without tubes, but every time I went to the track the left rear would start to leak after 1 pass. Since I drive them on the street on occasion, I had tubes put in. I think the Hoosier site states running tubes is your option but they reccomend it if you drive them on the street. My best 60' so far was a 1.59. I think my 60' is more limited to HP than traction.