it is radius of smallest circle that can be drawn by the vehicle during turning.
The cars turning radius is not determined by the brand of tire.
You find the diameter and divide it by two.
There is an inside radius and an outside radius. Both are the radius of the curve required by the car to maximize the turning capabilities of the vehicle. The variables are the length of the vehicle and turn angle of the tires relative to the body of the car. So a typical car would be much less than a large truck. All makes and models vary.
It should be more than 900
Try the related link. It might help you.
Measure the distance from the point of connection at tow unit to center of trailer wheel (if tandem axle trailer measure to center between tires) multiply distance by 2 and this will get you close to the turning radius.
20.6 ' turning radius
The turning radius of a Mercury Villager may depend on the year in which it was made. The turning radius is 38.7 feet for vehicles made during the 1993-1998 period.
Double the Radius to Calculate the Diameter.
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