The acera m3050 triple hydraulic disc brake sti lever from shimano is a great value mountain bike disc brake sti lever for crisp and precision shifting compatible triple ring chainsets its low friction design means that shifting is light and responsive with short stroke action that reduces the amount of effort you put in to shifting the lever is shimano hydraulic disc brake compatible and also features an easy to read optical gear display an barrel adjusters for fine tuning your gears availa