Since people also use Alivio on trekking bikes for many years, Shimano decided to make a dedicated trekking groupset. The new trekking groupset is the most silent and durable Alivio groupset ever made. Compared to the mountain bike version, the trekking groupset has cleaner appearance. The rear derailleur clearly shows the different design. In contrast to the RD-M4000 the rear derailleur RD-T4000 offers the Double Servo Panta Mechanism and not the Shadow technology. The Double Servo Panta Mechanism keeps rear derailleur guide pulley a uniform and constant distance from each sprocket.