Those bearings have excellent specs, with higher radial load capacity than a 20mm ID tapered roller bearing - you definitely exceeded Mouldy's design there . If you ever need an upgrade, look at this:



Specifications: http://medias.schaeffler.com/medias/...PP*SL045004-PP

2.7 times the dynamic load capacity and still only 42mm; I am looking at these for when I design a drum to replace the beaters in my current bots.