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@Nick_S
One day I'll get myself a Brompton front wheel built with a Phil Wood hub.
For now, I'll use my relatively new Brompton hub until the rim wears out, which should not take too long with the gradients in Sheffield. A bit more Web searching suggests an optimal set of loose ball bearings will be Grade 10 Chrome, which have a hardness of 60-67 HRC, compared to the Grade 100 Stainless ball bearings with a hardness of 52-55 HRC. Simply Bearings seem to offer them relatively cheaply.