diameter

[CyberPhoenix]

what is the diameter of the mecenum wheels

[sbdrobotics]

They are 4 inches in diameter,

[LegoMindstormsmaniac]

It is actually right in the name of the product: http://vexrobotics.com/276-1447.html

~Jordan

[ifticar2]

I’m assuming you made a mistake and put diameter instead of width. In that case, one wheel is 50 mm wide, but your spacing should be at least 55 mm.