I just built up a drop bar MTB for commuting. It uses it's original 7speed rear cassette, and RD that came on the bike.
I swapped out the original shifters when I went to drop bars. Instead, I bought Rivendell's bar-end shifter pods, and hooked them up to the 7speed indexed DT shifters that originally came on my C-dale touring bike.
Now when I got on my MTB for it's maiden voyage, it tries to downshift into the larger gears on the cassette every time that I put down any amount of serious force on the pedals. It makes that "clack-CHUNK" sound as it tries to downshift and then falls back into it's proper gear. it probably does this once or twice on every pedal rotation. What's going on?
The shift lever is staying in place during all of this.
Thanks in advance for your advice. I know it's probably something stupid, so I appreciate your patience and advice with a noob like me.