I certainly didn't install it. Purchased this model from a Sports Chalet (which just shut its doors this year along with Sports Authority). Personally, I worked with the barrel adjusters on both the big and small and between the shifting and the disc brake system (Promax Render R), I essentially have a comfortable and smooth riding bike that I hate to ride. Got the steed at a steal, and for the current time am not prioritizing throwing more money at a new groupset/brakeset upgrade, considering how little miles I already have on her.