Depending on the Yerka model you have, the pattern of both the nut and the adapter may vary. We do this to make sure there are as many combinations as possible, to keep your wheels always safe! Your Yerka comes with two anti-theft nuts, one for the front wheel, and one for the rear wheel. Here is a video explaining how to install them.
* V2 model has two dimensions of nuts, M9 for the front wheel and M10 for the rear wheel.