Join Date: Dec 2004
Bikes: 1982 Bianchi Superleggera (restored with NOS campagnolo components), 1987 Bianchi Campione Del Mundo, 1995 Bianchi Denali (M900/950 XTR components, viscous cycles rigid fork, mavic ceramics), 1996 Specialized Hardrock (winter beater, 8 speed XT group
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Don't know the size but a bearing supply shop should be able to match you up with a generic sealed bearing. I'd bring in the hub/bearing so they can measure things. I've done this with all kinds of equipment besides bikes, they just take out micrometer/calipers to get bearing size then match things up. Might be considerably cheaper and/or better quality than the original too.
I've not been inside Mavic hubs but my guess is you can just tap them out with a soft metal (e.g. copper, brass) drift.
If you have luck post results/source so others can also be aware of alternative parts sources.