Hello Yura,

YB bearings should be finding their way into distributors now at standard size, 0.25mm undersize will be available within a week. These have been produced with a "racing notch" which does not show in the bearing face to prevent disruption to the oil film. We use this style of notch extensively in racing bearings - I'd include a picture, but I can't seem to add attacments to posts.

You will need to purchase from a UK distributor (there are a few on here) as these items are UK only currently as my colleagues in Europe think there is no demand for these items.

Regards,
MAHLE UK