Rover V2 robot wheels

Hi,
I have been working on the Rover V2 robot set. I am following the starter video but have a problem with the wheels. Just like in the video, when I attached the back wheels on to the motor, they seem to stick further out from the main body than all the other wheels. Therefore the track does not fit on properly.
Does anyone have an answer?
Thanks.




Check that the metal hex shaft is fitting into the hex insert inside the wheel(s) - rotate the wheel and push to see if it “slips” into place.
Double-check the assembly of the gearbox to ensure the shafts which support the drive sprocket are correctly positioned.
These are mass produced in very high quantities, so the likelihood that something is wrong with the part is minimal.
If the above does not resolve the issue, check the see if something is inside the sprocket which might block the shaft.

Looks like you’re almost at the end - hope you enjoy it and looking forward to seeing it climb over obstacles!