FINDING SOME WHEELS??

Hi Everyone I have a little problem for you.

I'm building a line follower but I could not find how to adapt the axle to the wheel. I
attached some images so you can see what I'm talking about.

First, let me show you the robot:

TOP VIEW

BOTTOM VIEW

RIGHT SIDE VIEW

AND THE AXIS DETAIL(The problem) It´s like a half circle

I am aware that these engines are spinning very fast but I tried a robot with some wheels that I had out there. The motors are connected with a battery of 11 volts of which I am using only 7.9 volts since it has 3 gnd, one for 3.3 volts, another for 7.9 volts and another for 11.1 volts.

My question is how can I adapt a wheel to work with the motor shaft.

Pololu has a good collection of wheel and parts.

Also,

robot shop

tower hobbies