Random thought, racing sprint for so long and recently switching to dirt, I am wondering about cutting down a 40MM. I am wondering if the 40MM axle will help increase grip on those larger 1/5th mile + tracks that are hard and slick. Track is large so you do not want to overprep and lose roll speed, so maybe a 40MM axle will help increase grip at the rear with out losing that roll speed. Possibly let you run tires that are 5pts harder. Has it been done before? Are 40mm axles even legal in the various dirt oval series?