Retro Mirror Sprintech MTB/City Pair of Black Mirrors. Mirrors for Mountain Bikes/Straight Bar. Ideal for urban commuters. Placed on both sides of the handlebars, the Sprintech MTB/City rearview mirror is easy to install. Simply remove the caps from each end of the handlebars and insert the Sprintech MTB/City rearview mirrors. Once installed, simply adjust to the desired position.