The SLX M7100 series of derailleurs deliver advanced shifting performance with decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with Shimano's new 12-speed cassettes boosts range. Details: CAGE LENGTH SGS/Long TOTAL CAPACITY 41T MAX FRONT DIFFERENCE 0 COLOR SERIES COLOR MOUNT Direct attachment (conventional)/Direct mount compatible NUMBER OF PULLEY TEETH 13 SERIES SLX GENERATION M7100 MAX LOW SPROCKET 51t MIN LOW SPROCKET 45t TOP NORMAL SPRING TYPE Shimano Shadow RD+ REAR SPEEDS 12 WEIGHT 316 grams