ISB valmistaa pyörien bearings bicycle bottom brackets, hubs, headsets and full-suspension frame pivots.
The bearing code tells you its dimensions. For example, a 6802 measures 15 x 24 x 5 mm. A sealed bearing is better protected against moisture and sand. Moisture, snow, road salt and sand put a strain on your bike and increase the need for servicing, and the bearings are often the first place this shows.
A grinding or loose bearing should be replaced promptly. A press is needed for the job, so we do it in our workshop.