Radial Tire Top End Violent Wobble At Deceleration

[CrateCamaro]

Originally Posted by Rusty Davenport

Thanks Angelo.....I'm trying to talk my mother-in-law into making the next test run...I'm not looking forward to it. 1996 Camaro........GT/EA.....Car is 3135 lbs-----Hoosier Radials 14.5 X 32------11 lbs air-------very light initial tap the breaks at the finish line, get off the brakes then it goes crazy, let the car coast the to the end after the coronary. I think if I really panicked and got on the breaks hard it would only get worse and roll the car. This is not something you "drive" out of, you have to experience it to understand. It actually feels like the car is leaving the track upward and then side to side....geeeeeeesss.

Maybe I missed it but I didn't see if you posted what size rim you were running. When we used a set of radials for the first time rocked like crazy with the same tire as you but on a 12in rim. Moved up to a 14in rim and it got better but it was still there. Dropped tire pressure from 17psi (recomended by other racers) to 14.5 and never looked back. I wouldn't run anything under 13.5psi in a radail only because I think that the center of the tire will convex when the car leaves. I could be re-inventing the wheel but 14.5 always works with no "Radial Rock"