Shimano deore m590 v brake 9 speed shiftergreat value deore 9 speed trekking bike sti lever set for crisp gear shifting the new mtb dual control lever sets a new standard for shifting ease it lets you shift gears up or down regardless of your hand position on the handlebar internally shifting is executed by the tried and true high precision indexing system found on the m950 series of xtr featuring three sets of ball bearings that result in more precise shifts a shorter lever stroke and a