Originally Posted by QDRHRSE

There's no way we can give you spot on advice without knowing more about the track you plan on running on. You can't go wrong starting at 69/30 or 72/31. Our track is 110 x 70 or so and its been really hot. I'm running 69/32 with a 17.5 (can timing cranked). A friend of mine runs 69/34 w/his 17.5. Generally speaking I've heard the D4 likes to be geared a little tall.