Check the listing for details. Mountain bike replacement hub bearings 6903 2RS or 61903 2rs quantity 2. Condition: New. Listed at 24.93 USD. To check for correct bearing numbers simply remove the old bearing and read the bearing number which is wrote on the rubber seal of the bearing. Please note you may have to clean grease off to view it. The Stock house is a small business where you will find great products at bargain prices. We specialise in getting you the products you want when you need them. Should you change your mind on the product you receive returns will be accepted within 7 days of purchase with return postage costs at the expense of the buyer The Stock house is a small business where you will find great products at bargain prices. We specialise in getting you the products you want when you need them. Should you change your mind on the product you receive returns will be accepted within 7 days of purchase with retur.