EP21 사각 BB 정비하기- 바텀브라켓 소음 정비. 엘파마 V-4000 / 자전거정비

Hello. Today, we will repair the bottom bracket (BB) of the square cartridge. I will disassemble and clean the square BB of the ELPHAMA V-4000 model, and put grease in it and reassemble it. Noise from BB is often caused by noise from various connections such as pedals, cranks, and seat posts. It is not easy to find and solve the cause by listening to the noise. One by one, the cause must be removed step by step. It is recommended that the bottom bracket be regularly inspected and maintained about once a year. 00:00 Introduction 00:18 The Role of BB 00:39 When you need to check BB 01:30 Find out the type of BB 02:17 Square cartridge BB disassembly 03:23 Square BB Specifications 05:23 Square BB assembly