The spool locks both tires-axles together. On tight turns--which race cars do not do--the inside wheel wants to turn faster than the outside wheel, the outside wheel will not let it and one tire will break traction and hop, that is hard on the axles. In the rain its Ok cause the tires loose traction easily but on dry pavement it stinks.
No power steering is helpful cause you tend to make wider turns
In Target parking lot all the women shoppers will be staring at your car wondering what is wrong with it as you park it and the tires are groaning, lol
