Mecanum wheels - bearings?

[jgannon]

Originally Posted by smcmahon

I saw those yesterday. They lead back to my original question, of whether or not they will "fall in" inside the wheel without a flange/edge. ie: what's to stop us from pushing them in too far?

Third time's a charm... here's a 3/8" ID, 1-1/8" OD, with a flange:

http://andymark.biz/am-0573.html

(FYI, these were linked from the same page where you'd buy the wheels: http://andymark.biz/mecanum8.html)