[Andy Brockway]

sanddrag,

We used unground flanged 1/2" ball bearings from True Value Hardware in last year's single speed gearbox. No failures and the grearboxes have plenty of life still in them.

I have switched to an R8 precision bearing for the dual speed gearboxes. This bearing is unflanged, the cost is not that high and they are readily available. I use button head screws on the outside to hold the outer race. I do not feel that the precision flanged 1/2" bearings are worth their cost for application.