Mechanical or electronic: Mechanical. Brake type: Rim brake. Rear derailleur: Medium cage (29-34T). What’s included: Shifters (Record 12), front derailleur (Record 12), rear derailleur (Record 12). Condition: Groupset is in excellent condition, components have been tested for functionality. Mechanic’s notes: Minimal scuffing on components. We will do everything in our power to resolve the issue.