100mm 右メカナムホイール

It looks like the metal claw holding them is deformed thereby tilting the rollers into each other.

Our team used these wheels on our FTC robot for Cascade Effect. We replaced some other Mecanum Wheels. The robot weighs about 65 pounds, and the ball bearings on the rollers on these wheels made a huge difference. With the other wheels the robot would barely move sideways. We measured motor current draw with old wheels and new, and these took 50% of the current. The robot is much faster and more maneuverable. We mounted the wheels using the 8mm hubs with the 'top hat' end inside the wheel. The hubs are just too big to fit into the wheel, so we had to turn the hubs down slightly to make them fit. Once we did that it was smooth.