Shimano Altus SL-M2010 9 x 2 Speed Shifter SetShimano Altus SL M2010 9 x 2 Speed Shifter Set Rapidfire Plus is suitable for fast shifting and allows riders to downshift three gears in one stroke. Rapidfire plus shifters all feature 2Way Release, which means that the release shifts by pulling on the index finger or by pressing the thumb. Instant Release shifts the cable loose as soon as the lever is activated, resulting in the quickest possible gear changes. Great value Altus mountain bike