Dual-Pull Cable Routing ( Convenient Dual-Pull feature allows derailleur to be set up for top or bottom cable routing according to cable anchor position). Compatible with 34.9mm frame tube Size. Reinforced Chain Guide (Special chain guide cross section offers high strength and rigidity for improved shifting response). Mega-9 Compatibility (Designed specifically for use with super-narrow 9-speed chains). Top-low Max. Capacity: 22T. Top-middle Min. Capacity: 12T. Top Gear Teeth: 44T. Mount Type Band: Material aluminum/painted. Outer Link: steel/painted. Inner Link: aluminum/painted. Chain Cage: steel/chrome plated.