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jut an update on my bike (the 1x12 mtb chinkslop):
the maintenance guy from supermarket came and he rode my bike for 20 mins and he said its fine. but this time I asked what he specializes in and ONCE AGAIN this guy is another air conditioner repairman motherfucker. I actually felt so funny I laughed in real time
then he wasn't able to diagnose my bike so he rode it to another bikeshop nearby and asked for repair. turns out the supermarket never had warranty for anything besides chainring, cassette,BB and frame. so I had to paid it all (repair cost was $7). the terrifying cracking sounds all came from my rear hub, it used little steel balls and somehow they were crushed. no more cracking sounds for now but idk if the same thing will happen to front hub? can anyone chime in and tell me what else should I inspect on my bike (per month or so)?