help pettal arm keeps falling off

GoldenMotor.com

Goat Herder

Gutter Rider
Apr 28, 2008
6,237
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N.M.
The arm at the square taper to bottom bracket must be deformed? This is something to check on new bikes if it is left loose and then ridden enough it goes down hill from there so to speak. Once they deform enough there not the same.