Need help with bottom bracket!
Hey, i'm new to the bike building scene, and I want to use my old Walmart bike frame but customize EVERYTHING else on it. I'm stuck on my bottom bracket. Does anyone know if a new closed-ball bearing would fit inside this bottom bracket casing. I noticed most new bikes don't have the sidings (bumps) that this one does. I want to put in a ball-bearing (shown below) into this. Anybody know FOR SURE if this will fit? I don't want to guess and be out a lot of money. Also, can anyone tell me if the know EXACTLY the dimensions of the bottom bracket. All I know is that it is 68mm by something. Thanks in advance!Attachment 369657Attachment 369658