[nhramnl]

I've experienced radial wobble, and as a result, studied it intensively, looking for a cause. Much as I hate to say it, Ed Bigley is probably the closest to what I've learned. The prevailing theory is that the car does not come down from the wheelstand entirely evenly (i.e. one front wheel touches before the other) and that sets off the rocking motion, which gets worse as you progress down the track. Here are other things that affect, but do not eliminate it: shock settings (tighter shocks on the rear tend to reduce it); track prep (as Ed mentioned), but for me, it had a VERY minor effect; and finally, tires themselves. Hoosiers are "credited" with being the most susceptible to wobble, Mickeys are supposedly better and Phoenix allegedly won't wobble at all. The tire pressure everybody talks about for a relatively big tire is 18-22 psi.