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I just got a new bike and know very little about maintenance. I rode
it for about half an hour on a mag-trainer and it worked very well.
Today, while riding, after about five minutes, the front derailleur
shift lever just started loosening and causing downshifting. I can't
figure out how or why the lever is loose, it has a plastic nut that I
can finger-tighten, but am afraid to put too much torque on it for fear
of breaking it. I can pull the cable with my finger and cause the
lever to loosen and downshift. The levers are mounted to the downtube
and are shimano SIS the model is SL-SY20A
Thanks for your help
it for about half an hour on a mag-trainer and it worked very well.
Today, while riding, after about five minutes, the front derailleur
shift lever just started loosening and causing downshifting. I can't
figure out how or why the lever is loose, it has a plastic nut that I
can finger-tighten, but am afraid to put too much torque on it for fear
of breaking it. I can pull the cable with my finger and cause the
lever to loosen and downshift. The levers are mounted to the downtube
and are shimano SIS the model is SL-SY20A
Thanks for your help