The Grom axle is 12mm, it uses two 6301 wheel bearings, which are 12ID x 37OD x 12W. I can't help you with the hub width.
This is a discussion on Grom wheel questions within the Honda Grom / MSX125 forums, part of the General Talk category; Have access to a set of grom wheels but dont wanna waste money shipping if they arent gonna work for me. I have a street ...
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Thread: Grom wheel questions