The more I follow your tread err, thread () the more I learn! Scrub radius will be a good conversation topic for my car nut friends.1950s large American cars had as much as 4" of scrub radius, that's why.
Scrub radius means the center of the tire is further from the center of the turning pivot.
If you hold a tire still and just rotate it on it's center pivot with your hands, you will find it hard to rotate because the tread is gripping, but if you put the tire on a stick and rotate it in a circle around you, it's very easy to turn. That's scrub radius.
And that is why scrub radius affects the weight of the steering in car parks and slow speeds.
Problem is the more scrub radius you have, the more the wheel deflects when you hit a bump because of the leverage factor, balance must be found, or add power steering.
This is the sort of scrub radius older cars with no power steering had (example only), you can picture in your mind that the wheel rolls around the steering axis (thick dotted line). Most modern cars have very little, and will leave blacks marks on the road when turning stationary, but the power steering overcomes that, and front wheel drive cars are mostly inside the steering axis for other reasons.
View attachment 25420