CAGE LENGTH SGS/Long,GS/Medium TOTAL CAPACITY 35T,41T MAX FRONT DIFFERENCE 0T COLOR SERIES COLOR MOUNT Direct attachment (conventional) TENSION PULLEY BEARING Sealed Bearing GUIDE PULLEY BEARING Sealed Bearing NUMBER OF PULLEY TEETH 13T SERIES XTR GENERATION XTR M9100 MAX LOW SPROCKET 45T,51T MIN LOW SPROCKET 45T TOP NORMAL SPRING TYPE SHIMANO SHADOW RD+ REAR SPEEDS 12