5 II---Shimano Bottom Bracket. Small Ball Bearings For Better Rotation Better Sealing 1009900(002a-003a)3/3 50323(5:5/5/23:ari 73123(10:8/2---#81423(10:8/16/23:ARI 103023(10;11/01/23:ari 11524(10:1/17/24:ari----1:rtn on 2/27/24 3/14: made zero review it & update