Hi folks!
Looks like a stupid question, but… how cant I connect a “Cytron Mini Wheel 46 x 10mm” (robotshop.com/productinfo.aspx?pc=RB-Cyt-42&lang=en-US) to a “GM3 - Gear Motor 3 - 90 degree Shaft” (robotshop.com/productinfo.aspx?pc=RB-Sbo-02&lang=en-US)??????)
Thanks!
Mauricio
I actually bought these two pieces…
(Cytron Mini Wheel and GM3).
What kind of adaptation could I do?
How about put a bolt on it? 
Thanks Coleman. Next time I’ll try to use the right motor and wheel. 
Can’t really - at least not without some significant modification after purchase. If you want the GM3, consider the following wheel instead:
GMPW Series Wheels (available in a variety of colors).
You could drill out the hole to the diameter of the GM motor shaft, then glue the motor in place.
There are many options - just need to find one which works well.