Data is arranged to one block obtained after a CIRC process so that a predetermined data pattern is recorded into a predetermined portion on a disc. The dashboard is coupled to the headlight by the connection member in a modularized manner. Thus, the measurement support system can reduce the burden on users of the measurement device. The positioning plate is coaxially secured in the sleeve component and has a positioning part engageable with a selected one of the first and second engaging parts with respect to an axis of rotation of the axle ring component, so as to provide a substantially horizontal position of use for the article holding accessory when the handle is at either one of the front and rear inclined positions. Into the outer face of the mantle of at least one roll in said belt support member, a substantially spiral-shaped groove has been formed, which extends across the axial width of the roll mantle.