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Hello, I wanted to ask you for help. I bought the BAFANG BBS01B 36V 250W kit with Hailong 17.4Ah battery, to mount it on a SPECIALIZED STUMPJUMPER COMP HT 29 "from 2012. The problem is the size of the bottom bracket, the cylinder of the MTB is of length 73.5 mm and the internal diameter is 45.5...