Shimano STEPS SW M8150 IR XT Shift Switch Right Direct Attach To Brake Lever CheckoutSpec= Centerlock Machined from high end aluminum Promax Machined from high end aluminum Promax 4 bolt 104 BCD chainrings are designed to handle the torque and stress of modern BMX racing and are fully capable in other single speed applications the Air Tool Big Bore Pump packs massive volume per stroke Easy and intuitive access lever with short stroke for quick and responsive operation AUTO SHIFT mode uses an advanced shifting algorithm to continually analyze data from multiple sensors to automatically put you in the optimal gear without requiring manual input at the shifter