Souped up for exactly the responsive performance you need out on the trails the shimano saint sl m820 10speed rapidfire pod 2nd generation i spec b mount feels like an extension of your body this shimano mtb shifter features specially developed 2 way release technology for a versatile ride the upper level still performs with the same shift function but can now swing in either direction allowing it to be released by the thumb or index finger optimised for one finger braking with crisp insta