Chain kept jumping off, and chain rub at FD and other fitment pains of 2 b by

Wheels of Happiness

Rizal Philippines

5.19.2021

The chain kept falling off the front chain ring.  I was tempted to go to the LBS mechanic.  

I found out the cause - the high position of the front derailleur relative to the largest chain ring.  Since the large chain ring has been removed, the clearance between the lower edge of the FD and the tooth line of the chain ring should be at least 2 mm (a coin thickness)  The current clearance is about 150 mm.  

So I lowered the front derailleur.  

Furthermore, there is a chain rub that would not diisappear despite the adjustment of the limit screws.  There is where the barrel adjuster was useful.  I turned it CC or CCW until the sound disappeared.

Two problems solved..  No need to go to the mechanic.

Barrel adjuster is king

Removing chain rub using the barrel adjuster