The invention relates to a conveying system (100) of an escalator comprising a lower transition area (102) at the lower end of the escalator, an upper transition area (101) at the upper end of the escalator and a step chain (110), wherein the step chain (110) comprises a plurality of chain links (111) and inner rollers (112). Further, the conveying system (100) comprises a plurality of steps (120), wherein each step (120) is connected to the step chain (110) via at least a first supporting point on each side of the step (120), and wherein each step (120) comprises a tow roller (121). Further, the conveying system (100) comprises a tow roller guide rail (103) to guide the tow rollers (121) of the steps (120). Especially, the step chain (110) comprises outer rollers (113), wherein the outer rollers (113) are adjusted to the chain links (111) of the step chain (110), wherein the outer rollers (113) are guided within an outer guide rail (106).