If your crankset is very close to the bike frame like in this picture, you either need a longer bottom bracket or to replace your middle chainring with a smaller one. (sopuli.xyz) The bike's body bends during use and it will scratch itself on the ring teeth and the chain. Sometimes older bikes have a bigger number of teeth on the middle chainring like this (s:m:l ring teeth ratio is about 32/48/52 teeth)....
Countries where the Current Leader assumed Power by Coup d’ètat (sopuli.xyz)
What year is it right now? (sopuli.xyz)
If your crankset is very close to the bike frame like in this picture, you either need a longer bottom bracket or to replace your middle chainring with a smaller one. (sopuli.xyz)
The bike's body bends during use and it will scratch itself on the ring teeth and the chain. Sometimes older bikes have a bigger number of teeth on the middle chainring like this (s:m:l ring teeth ratio is about 32/48/52 teeth)....
Coalescence cascade (sopuli.xyz)
https://v.redd.it/7clgktkka0xa1/DASH_360.mp4
Lego Tensegrity (sopuli.xyz)