[Angelo DiTocco]

Radials are more sensitive to everything -- like bumps on the track, shock settings, etc. But..... If your wobble is developing down track, definitely check the balance of the tires before you do anything else, next check the shock settings - make sure they're set the same from side to side... If you get a wobble developing closer to the starting line, like after the car settles down from the wheelstand then jack the front end up and check your suspension travel.... meaning how far your front wheels drop. Make sure that is the same on both sides.... If it's off... do what you got to do to correct it. Cars with uneven front end travel will go into that wobble when one side's front wheel touches down ahead of the opposite side and then continue for the run. With bias ply tires you'd never notice it.... but with radials the imbalance gets transferred right to opposite side rear wheel and then across to the other rear wheel. It sometimes happens past the finish line when you let out of it. But in your case - if it's fine until half track or 1000ft, and there's no bumps in that area of the track..... then I'd rebalance the tires first and see if that does the trick.