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eldweebio
There's more than enough love for Shimano hubs on this forum
Novatec are not the worst offender, but when you can make sales by advertising low weight, why wouldn't you let the idiots with more money than sense have undersized bearings? Stick to the basic rather than the ultralight models and they're fine.
Shimano have big balls - 9×¼" per side in the rear hub. To get that in a conventional cartridge bearing, you'd have to go all the way up to a 6004 (8×¼") which is 20mm bore and 42mm OD