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Training of 82 rear ball bearings, be careful, don't do it for any ball, only the ball that is damaged, don't take it from a lathe, it is better to use it from a lathe, Mr. Bicycle teaches, sells bikes, there is also a Scott and Cube dealership, Hossein Chegini 09125847976 02144705022 Address Tehran Shahrek Golestan, at the beginning of Amir Kabir Blvd., in front of the electric substation, No. 56, free consultation #education #bike #training #online #free_training #exercise #riding_bike #riding_bike #training #repair #Hossein_Chegini #motodoch