The SHIMANO ALIVIO M3100 rear derailleur delivers a low profile design that lets you ride aggressively with fewer interruptions thanks to its SHIMANO SHADOW design. Details: Low-profile design Total capacity: 45T Max. low sprocket: 36T Adjustment barrel Specs: CAGE LENGTH SGS/Long TOTAL CAPACITY 45 MAX FRONT DIFFERENCE 22 CABLE ADJUSTER X COLOR SERIES COLOR MOUNT Direct attachment (conventional) NUMBER OF PULLEY TEETH 11 SERIES Alivio GENERATION M3100 MAX LOW SPROCKET 36 MIN LOW SPROCKET 32 TOP NORMAL SPRING TYPE Shimano Shadow RD REAR SPEEDS 9 WEIGHT 276 grams