SpringRC SM-S4303R continuous servo motors and wheels

I brought these servo motors and wheels from Pololu:


The problem that I have is that the wheels do not fit the servo splines of the motors even though on the site, it says that those two go together. Did they send me the wrong products and I need to contact customer service?


The wheels might be tight, but they should fit if you push hard. Are you sure you have the splines aligned?

- Ben