Given that you seem to be competent with replacing sealed bearings - pretty much any of them with sealed bearings. When the bearings get a bit slow just replace them.
Yeah you are right. Thanks. Cheap and light is key here :)
http://www.eshop.novatecwheels.eu/category/hubs-non-disc/a741sb/
and
http://www.eshop.novatecwheels.eu/category/spare-parts/axles-and-side-caps/side-caps-9mm-threaded-for-d771sb/
@Hulsroy started
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Given that you seem to be competent with replacing sealed bearings - pretty much any of them with sealed bearings. When the bearings get a bit slow just replace them.