The mechanism is similar to 'double tap' from another brand, but the shifters aren't identical to those---There aren't multiple lever paddles, there is elegantly only the one lever that operates the brake, and in the manner described ahead, also operates the shifting. Actually nice to use. -On the right/rear lever, to shift to low (easier) gear, you give a strong push of the entire brake lever inward, that is, toward the centerline of bike. To shift back toward a higher (harder) gear, you press