Radial Tuned Suspension was essentially harder bushings to compensate for the more flexible radials. I used to run bias ply tires when I first started auto-slaloming my car. They were quite forgiving in a slide, which I always enjoyed (drifting is NOT new!). Neither the tires nor sliding were particularly fast. The first slalom I did with the "new" BFG TA's I looped the car twice doing trail-braking. I had swapped the front drums to disc's but didn't change to the proper proportioning valve, 'cause the car needed a bit of help to pivot on tight corners. With the radials, the car let go quite a bit sharper, so it took a bit of getting used to.
