Question { VECV, 7378 }

WHAT IS KING PIN OFFSET?

Answer

A geometric parameter which is positive if the kingpin axis
intersects the wheel plane at or below ground level, or is
negative if the point of intersection is above ground level.
Also called scrub radius

Question { Cummins, 13255 }

WHY BIG TYRE USED IN REAR OF VEH?

Answer

Tractors have big rear tires because ,the larger the surface
area of the tractor's wheels touching the ground, the more
pulling power you have. Like how tractor pullers have large
tires.

Another reason is that the tractor doesn't have to operate
at a higher speed to get the same ground speed with larger
tires. Gear ratios don't have to be as high b/c of the
larger tires.