14135 Model 58mm Plastic Omni Wheel for LEGO NXT and Servo Motor  features:

This is a latest design of 58mm LEGO compatible Omni directional robot wheel, It’s useful as they roll freely, The 58mm plastic omni wheel is a robust,

durable and double row wheel that provides easy 360°movement prope with rotational and sideways manoeuvrability. It comes with an NXT compatible hub 

and an Axle Centre hub for the Arduino motors. if you use this omni wheel on your robot, it can be able to forward/backwards and rotation without changing its orientation.

Specifications:

Body&Roller Color: Black

Wheel Diameter: 58mm

Roller Diameter: 13mm

Body Material: Nylon

Roller Material: Nylon+PE

Load capacity: 3KG

Net weight: 60g

14135 Model 58mm Plastic Omni Wheel for LEGO NXT and Servo Motor Pictures and Drawing as below:

What are the advantages and disadvantages of the Omni wheel?

The advantages of the Mecanum wheel and the omnidirectional wheel are flexibility and convenience, and the disadvantage is expensive. The omnidirectional wheel, as the name suggests,

 can move in any direction, at any angle, and in any direction. mecanum wheel these rollers having an axis of rotation at 45° to the plane parallel to the axis of rotation of the wheel.