The acera m3050b 9 speed hydraulic disc brake sti lever from shimano is a great value 9 speed mountain bike disc brake sti lever for crisp and precision shifting compatible with mega9 and 9 speed cassettes 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 tuni