Quote:
Originally Posted by sanddrag
Also, keep in mind that only the motors in the kit + 2 small CIM + 1 large CIM are allowed. No other motors.
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Rule R45 allows the purchase of up to two additional 2-1/2" (small) CIMs for use on your robot.
<My bad. I didn't read the above quote correctly.>
To check out where the friction might be, try moving the wheels or treads without the gearbox or motors attached. If that is smooth, add the gearboxes (if you are using any) and try moving them again. If that is smooth, add the motors and try it again. That should help you figure out where the friction is coming from.
Good luck.