I am resubmitting this question which I have posted in the past, in the hope that some additional ideas may come up.
I am trying to correct a problem I have on my Trek 7300 hybrid.
For about a year there has been a ratcheting feeling in my feet when I pedal. It is mostly when I am in the highest two gears (smallest sprockets) on the rear derailleur, but can happen in the third smallest sprocket as well. It does not really happen in the low gears (large sprockets) of the rear derailleur and it does not seem to matter which of the three gears I am in on the front derailleur. This is why I suspect it is a rear derailleur problem.
My rear derailleur is a SRAM X7.
Four months ago the bike shop had to replace the rear derailleur’s handlebar twist shifter, as it was not clicking firmly into gears & was slipping out, but this did not affect the ratcheting feeling in my feet when I ride.
Do you have any ideas I could try? If you need a photo of the rear derailleur I could try to send them as attachments if the website permits it.