Reinvent the wheel!
Omni-Directional wheels roll forward like normal wheels, but slide sideways with almost no friction (no skidding during turns). Use these wheels to make your robot turn smoothly or build a holonomic drivetrain. These wheels are the same size as the VEX 4" dia. Wheels.
As the name suggests, an omni-directional wheel can travel in more than one direction. When the axle spins, it behaves like a normal wheel. However, you’ll notice that there are rollers all around the outer circumference. These rollers allow the wheel to travel sideways as well!
4" Omni Wheels roll sideways with very little friction.
Minimize skidding during turns.
Build a holonomic drive.