Originally Posted by
niliraga
does it tend to upshift by itself, without you doing anything energetic at the time of the ghost shift? i can imagine that a very gunked up RD cable could cause that, and maybe running new cable and housing might fix?
Yep, nothing energetic. I doubt this bike has 50 miles on it. I wonder if the problem is lack of use. The seller did oil the chain and derailers. Maybe lack of use affected the cables.