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Don't lock the tyres can also avoid being stolen.
There is a lock on the front part of the bicycle,so when we are going to lock it,we just need turn the headstock 90°,and then lock it.It is very easy to do it,even if you are sitting on the bicycle.
The angle between relative motion direction and force direction is 90°,it is vertical.So it is very very difficult to ride it,there is no suitable place to put hands,and it is almost impossible to make the bicycle forward because of the frictional force and the 90° angle. The bicycle will do circular motion if the thief push the bicycle.