Ok newbie question:  :dunno: I can't seem to master downshifting.  My bike jerks and sometimes the back wheel chirps....is this how downshifting is supposed to be?  I'm not even really travelling fast  :-k newbie question:  :dunno: I can't seem to master downshifting.  My bike jerks and sometimes the back wheel chirps....is this how downshifting is supposed to be?  I'm not even really travelling fast  :-[