The utility model is a kind of foot ring structure improvement of related what,Its include one first ring body,One recess formed arc portion on what the first ring body lateral wall,Plural number defines the second ring body at the first ring body of what both ends respectively and plural number defines what those second ring bodies between the first ring body side away from portion,And the surface curvature in those spacing portions is different with the cambered surface curvature of interior arc portion,And an at least marking part is formed in interior arc portion for identification； System can directly contact with the second ring body and be separated by spacing portion when therefore being rubbed on the outside of foot ring,It is worn to avoid marking part and leads to not recognize,And even if the second ring body and spacing portion are worn,Still marking part can be protected not to be abraded away totally by the cambered surface curvature of interior arc portion,Thereby enabling the utility model reach can effectively avoid because abrasion leads to not the practical improvement of identification.本新型為有關於一種腳環結構改良，其包括有一第一環體、一凹陷形成於第一環體外側壁上之內弧部、複數分別界定於第一環體兩端處之第二環體及複數界定於該些第二環體鄰近第一環體側處之間距部，且該些間距部之表面曲率與內弧部之弧面曲率相異，並內弧部上形成有至少一標示部以供辨識；因此當腳環外側受到磨擦時係會直接與第二環體接觸及被間距部隔開，以避免標示部受到磨損導致無法辨識，且即使第二環體與間距部被磨損掉了，仍可藉由內弧部的弧面曲率來保護標示部不會被完全磨掉，藉此令本新型達到可有效避免因磨損導致無法辨識之實用進步性。
