Aeroglide pulleys new tooth pulley design with a sound damping effect for a super efficient and silent ride experience bottom and top pulleys benefit from this feature exact actuation when we launched our road technology from scratch we reapplied our mtb proven sram 11 actuation ratio shifter cable travel d233railleur movement for 10 speed rear shifting ea helps to simplifystabilize the uneasy act of balancing rear d233railleur hanger design tight cog spacing and exact cable te