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I always use grade 10 chrome balls in hubs
↑This. If you're just doing a few hubs, the price difference compared with lower grades is negligible. I tried the stainless balls in my RollerFort, but they exploded long before any corrosion resistance could be brought into play, so I'd avoid those in any bearing designed for Chromium Steel balls.
gbj_tester
I always use grade 10 chrome balls in hubs. They run smooth with these. Weldite balls should not be sold as they will ruin your hubs. Grade 10 bearings are not much expensive than grade 25 and are rounder. It what campagnolo use in there hubs ever wonder why they are so smooth and last so well. Chrome balls are harder than stainless balls which is a good thing. Stainless balls are also more prone to pitting than chrome steel. Chrome balls rust more easily if the grease runs thin so use a peristaltic grease.