Shimano SL-M610 Deore Shift Lever presents the drivetrain technology for mountain bikes: DYNA-SYS. This revolutionary technology uses a 10-speed cassette, but that is not the only feature of this system. Highlight is a completely redesigned drivetrain that creates real added benefits for the rider. It’s not only an extra gear… It’s about closer gear ratios for a smoother shifting performance and improved power transfer, It’s about riding optimized gear combinations that improve efficiency and durability. It’s all about performance: it offers a more stable drivetrain for any type of rider! Plus, Rapidfire Plus is suited to quick shifting, giving riders the ability to downshift three gears in one stroke. The shifters feature 2Way-Release, which means release shifts by pull of the index finger or push of the thumb. Furthermore, OT-SP41 maximally reduces the inner cable friction to provide quick response to operations and easy/effortless shifting. Moreover, power loss due to delay in shifting and fatigue by shifting especially when you ride on the terrain with many ups and downs as well as a long distance is also reduced. 8 color options are also available for outer casing to meet many requests.