Vim tias hom B sprockets yog tsim nyob rau hauv kom muaj nuj nqis, lawv muaj kev lag luam ntau dua rau kev yuav khoom dua li kev rov ua haujlwm ntawm cov khoom lag luam-bore sprockets, nrog rov tho txawv, thiab txhim kho qhov tseem ceeb thiab cov ntsia hlau. Tiav lawm bore sprockets muaj rau Standard "B" hom qhov twg lub hub protrudes ntawm ib sab.