a small turning circle, a tight turning circleを使います。1:33を聞いてください。tata nano can turn in a nice tight circle.です。nano's turning circle is very small. nano turns on a dime.でもいいでしょう。
http://www.youtube.com/watch?v=WX2HFVHbo18&feature=related 3:06 what about the turning circle? で、回頭半径は?