Check the listing for details. Mountain bike bottom bracket replacement bearings MR24377 2RS 24377 MR. Condition: New. Listed at 37.73 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. Due to the work required to change the bearings we generally recommend the stainless steel bearing for the majority of applications and Ceramic for the riders looking for greater performance and durability • Put a small amount of grease on the rubber seal of the bearing keeping in mind that if there is too much grease dirt will accumulate. A small amount of grease can be put on the cup before pressing the bearing in but is not required. Please note that any bearings that have opened out of the packaging cannot be returned as they cannot be resold. Dimensions of the bearings are shown in th.