クロスバイクの改造とチューンナップ#18

526 ：ツール・ド・名無しさん：2016/10/01(土) 23:41:49.62 ID:Mx1VI+SY.net

today i bring my bike to the shop bought.
my Bianchi Roma4 causes odd noises from around cranks thesedays.
i thought B.B. is hard to die, so ive overhauled everywhere except it.

but, shop staff said, my B.B. has broken.
i ride my bianchi for only 3 months and only 2,500km.
my riding was wrong?
please tell me.

B.B. is RPM BB-7420ST