Originally Posted by
lmk5
...
With the bike on level ground and normal pedaling all is well. But when under some load, the front derailleur has trouble shifting from the middle chainring to the smallest chainring. Part of the chain does transfer onto the smallest chainring but it also hangs on to the middle chainring and won't complete the shift. ...
This might be normal. You should be able to shift the rear derailleur under some load, but not so much the front one. You have to learn to shift the front derailleur before you hit the uphill.