Geo;
A large amount of scrub radius can be felt on the street unless the street is smooth and level as a billiard table. Bumps, potholes, etc tend to pull the steering wheel one way or the other and under heavy braking it gets far worse. On the other hand, a little scrub radius is necessary to give a driver some feel as to what the front tires are doing. No bump steer gives a dead steering feel.
Regards, Neil Tucson, AZ Lake Tahoe, NV