We’ve eliminated the “pogo effect” by placing chain pulley on models Mini / 5 / MAX and Hardcore (note: on the economic line models a chain is guided without pulley.) Furthermore it is positioned on the axis made of a high quality stainless steel allowing the chain to swing smoothly from the left to the right according to the set up gear. This technical solution lengthens the chain’s lifetime and decreases a resistance that occurred on the fixed positioning of the axis.