Enduro 71801 ABEC-5

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ID x OD x Width: 12mm x 21mm x 5mm - Grade 5 steel balls with ABEC 5 precision- Made with a 15 degree contact angle NOTE: These bearings are directional. Always install with the OR ANGE/RED seal facing out, and "load" the inner race! These Angular Contact bearings are specifically designed for hubs that have a preload feature (and certain bottom bracket applications).In standard radial bearings, only 3 or 4 balls make contact during the load, at any given time.But in these A/C bearings, ALL balls are engaged and spread the force over a larger surface area, which decreases friction, and minimizes wear. Show more